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Finding the Fourth Proportional to 15,659.42, 21,618.88 and 9,918.55

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Solution

The fourth proportional to 15,659.42, 21,618.88 and 9,918.55 is: 13,693.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,659.42 : 21,618.88 = 9,918.55 : x
  2. Step 2: Convert to fraction form
    15,659.42/21,618.88 = 9,918.55/x
  3. Step 3: Cross multiply
    15,659.42x = 21,618.88 × 9,918.55
  4. Step 4: Simplify right side
    15,659.42x = 214,427,834.13
  5. Step 5: Solve for x
    x = 214,427,834.13/15,659.42
  6. Step 6: Final answer
    x = 13,693.22

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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.