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Finding the Fourth Proportional to 763.45, 1,053.57 and 431.87

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Solution

The fourth proportional to 763.45, 1,053.57 and 431.87 is: 595.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.45 : 1,053.57 = 431.87 : x
  2. Step 2: Convert to fraction form
    763.45/1,053.57 = 431.87/x
  3. Step 3: Cross multiply
    763.45x = 1,053.57 × 431.87
  4. Step 4: Simplify right side
    763.45x = 455,000.01
  5. Step 5: Solve for x
    x = 455,000.01/763.45
  6. Step 6: Final answer
    x = 595.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.