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Finding the Fourth Proportional to 21,689.86, 29,929.54 and 12,258.40

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Solution

The fourth proportional to 21,689.86, 29,929.54 and 12,258.40 is: 16,915.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,689.86 : 29,929.54 = 12,258.40 : x
  2. Step 2: Convert to fraction form
    21,689.86/29,929.54 = 12,258.40/x
  3. Step 3: Cross multiply
    21,689.86x = 29,929.54 × 12,258.40
  4. Step 4: Simplify right side
    21,689.86x = 366,888,273.14
  5. Step 5: Solve for x
    x = 366,888,273.14/21,689.86
  6. Step 6: Final answer
    x = 16,915.20

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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.