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Finding the Fourth Proportional to 15,915.78, 21,957.21 and 9,629.10

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Solution

The fourth proportional to 15,915.78, 21,957.21 and 9,629.10 is: 13,284.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,915.78 : 21,957.21 = 9,629.10 : x
  2. Step 2: Convert to fraction form
    15,915.78/21,957.21 = 9,629.10/x
  3. Step 3: Cross multiply
    15,915.78x = 21,957.21 × 9,629.10
  4. Step 4: Simplify right side
    15,915.78x = 211,428,170.81
  5. Step 5: Solve for x
    x = 211,428,170.81/15,915.78
  6. Step 6: Final answer
    x = 13,284.19

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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.