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Finding the Fourth Proportional to 765.38, 1,056.19 and 450.63

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Solution

The fourth proportional to 765.38, 1,056.19 and 450.63 is: 621.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.38 : 1,056.19 = 450.63 : x
  2. Step 2: Convert to fraction form
    765.38/1,056.19 = 450.63/x
  3. Step 3: Cross multiply
    765.38x = 1,056.19 × 450.63
  4. Step 4: Simplify right side
    765.38x = 475,950.90
  5. Step 5: Solve for x
    x = 475,950.90/765.38
  6. Step 6: Final answer
    x = 621.85

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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.