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Finding the Fourth Proportional to 8,578.32, 11,840.64 and 7,954.92

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Solution

The fourth proportional to 8,578.32, 11,840.64 and 7,954.92 is: 10,980.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,578.32 : 11,840.64 = 7,954.92 : x
  2. Step 2: Convert to fraction form
    8,578.32/11,840.64 = 7,954.92/x
  3. Step 3: Cross multiply
    8,578.32x = 11,840.64 × 7,954.92
  4. Step 4: Simplify right side
    8,578.32x = 94,191,343.95
  5. Step 5: Solve for x
    x = 94,191,343.95/8,578.32
  6. Step 6: Final answer
    x = 10,980.16

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.