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Finding the Fourth Proportional to 21,531, 29,702.70 and 15,246.84

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Solution

The fourth proportional to 21,531, 29,702.70 and 15,246.84 is: 21,033.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,531 : 29,702.70 = 15,246.84 : x
  2. Step 2: Convert to fraction form
    21,531/29,702.70 = 15,246.84/x
  3. Step 3: Cross multiply
    21,531x = 29,702.70 × 15,246.84
  4. Step 4: Simplify right side
    21,531x = 452,872,314.47
  5. Step 5: Solve for x
    x = 452,872,314.47/21,531
  6. Step 6: Final answer
    x = 21,033.50

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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.