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Finding the Fourth Proportional to 1,487.72, 2,230.11 and 707.81

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Solution

The fourth proportional to 1,487.72, 2,230.11 and 707.81 is: 1,061.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,487.72 : 2,230.11 = 707.81 : x
  2. Step 2: Convert to fraction form
    1,487.72/2,230.11 = 707.81/x
  3. Step 3: Cross multiply
    1,487.72x = 2,230.11 × 707.81
  4. Step 4: Simplify right side
    1,487.72x = 1,578,499.83
  5. Step 5: Solve for x
    x = 1,578,499.83/1,487.72
  6. Step 6: Final answer
    x = 1,061.02

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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.