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Finding the Fourth Proportional to 21,691.36, 32,562.90 and 12,930.40

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Solution

The fourth proportional to 21,691.36, 32,562.90 and 12,930.40 is: 19,411.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,691.36 : 32,562.90 = 12,930.40 : x
  2. Step 2: Convert to fraction form
    21,691.36/32,562.90 = 12,930.40/x
  3. Step 3: Cross multiply
    21,691.36x = 32,562.90 × 12,930.40
  4. Step 4: Simplify right side
    21,691.36x = 421,051,322.16
  5. Step 5: Solve for x
    x = 421,051,322.16/21,691.36
  6. Step 6: Final answer
    x = 19,411.02

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