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Finding the Fourth Proportional to 763.52, 1,145.64 and 725.96

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Solution

The fourth proportional to 763.52, 1,145.64 and 725.96 is: 1,089.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.52 : 1,145.64 = 725.96 : x
  2. Step 2: Convert to fraction form
    763.52/1,145.64 = 725.96/x
  3. Step 3: Cross multiply
    763.52x = 1,145.64 × 725.96
  4. Step 4: Simplify right side
    763.52x = 831,688.81
  5. Step 5: Solve for x
    x = 831,688.81/763.52
  6. Step 6: Final answer
    x = 1,089.28

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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.