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Finding the Fourth Proportional to 8,717.94, 12,019.52 and 7,122.92

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Solution

The fourth proportional to 8,717.94, 12,019.52 and 7,122.92 is: 9,820.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,717.94 : 12,019.52 = 7,122.92 : x
  2. Step 2: Convert to fraction form
    8,717.94/12,019.52 = 7,122.92/x
  3. Step 3: Cross multiply
    8,717.94x = 12,019.52 × 7,122.92
  4. Step 4: Simplify right side
    8,717.94x = 85,614,079.40
  5. Step 5: Solve for x
    x = 85,614,079.40/8,717.94
  6. Step 6: Final answer
    x = 9,820.45

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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.