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Finding the Fourth Proportional to 15,719.60, 21,702.02 and 10,421.59

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Solution

The fourth proportional to 15,719.60, 21,702.02 and 10,421.59 is: 14,387.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,719.60 : 21,702.02 = 10,421.59 : x
  2. Step 2: Convert to fraction form
    15,719.60/21,702.02 = 10,421.59/x
  3. Step 3: Cross multiply
    15,719.60x = 21,702.02 × 10,421.59
  4. Step 4: Simplify right side
    15,719.60x = 226,169,554.61
  5. Step 5: Solve for x
    x = 226,169,554.61/15,719.60
  6. Step 6: Final answer
    x = 14,387.74

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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.