Home / 15,518.69-21,415.79-8,445.16

Finding the Fourth Proportional to 15,518.69, 21,415.79 and 8,445.16

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Solution

The fourth proportional to 15,518.69, 21,415.79 and 8,445.16 is: 11,654.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,518.69 : 21,415.79 = 8,445.16 : x
  2. Step 2: Convert to fraction form
    15,518.69/21,415.79 = 8,445.16/x
  3. Step 3: Cross multiply
    15,518.69x = 21,415.79 × 8,445.16
  4. Step 4: Simplify right side
    15,518.69x = 180,859,773.08
  5. Step 5: Solve for x
    x = 180,859,773.08/15,518.69
  6. Step 6: Final answer
    x = 11,654.32

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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.