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Finding the Fourth Proportional to 21,387.60, 32,085.98 and 6,395.88

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Solution

The fourth proportional to 21,387.60, 32,085.98 and 6,395.88 is: 9,595.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,387.60 : 32,085.98 = 6,395.88 : x
  2. Step 2: Convert to fraction form
    21,387.60/32,085.98 = 6,395.88/x
  3. Step 3: Cross multiply
    21,387.60x = 32,085.98 × 6,395.88
  4. Step 4: Simplify right side
    21,387.60x = 205,218,077.76
  5. Step 5: Solve for x
    x = 205,218,077.76/21,387.60
  6. Step 6: Final answer
    x = 9,595.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.