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Finding the Fourth Proportional to 21,689.85, 29,929.53 and 12,258.39

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Solution

The fourth proportional to 21,689.85, 29,929.53 and 12,258.39 is: 16,915.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,689.85 : 29,929.53 = 12,258.39 : x
  2. Step 2: Convert to fraction form
    21,689.85/29,929.53 = 12,258.39/x
  3. Step 3: Cross multiply
    21,689.85x = 29,929.53 × 12,258.39
  4. Step 4: Simplify right side
    21,689.85x = 366,887,851.26
  5. Step 5: Solve for x
    x = 366,887,851.26/21,689.85
  6. Step 6: Final answer
    x = 16,915.19

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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.