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Finding the Fourth Proportional to 21,555.31, 32,342.70 and 9,871.87

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Solution

The fourth proportional to 21,555.31, 32,342.70 and 9,871.87 is: 14,812.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,555.31 : 32,342.70 = 9,871.87 : x
  2. Step 2: Convert to fraction form
    21,555.31/32,342.70 = 9,871.87/x
  3. Step 3: Cross multiply
    21,555.31x = 32,342.70 × 9,871.87
  4. Step 4: Simplify right side
    21,555.31x = 319,282,929.85
  5. Step 5: Solve for x
    x = 319,282,929.85/21,555.31
  6. Step 6: Final answer
    x = 14,812.26

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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.