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Finding the Fourth Proportional to 765.38, 1,056.20 and 433.78

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Solution

The fourth proportional to 765.38, 1,056.20 and 433.78 is: 598.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.38 : 1,056.20 = 433.78 : x
  2. Step 2: Convert to fraction form
    765.38/1,056.20 = 433.78/x
  3. Step 3: Cross multiply
    765.38x = 1,056.20 × 433.78
  4. Step 4: Simplify right side
    765.38x = 458,158.44
  5. Step 5: Solve for x
    x = 458,158.44/765.38
  6. Step 6: Final answer
    x = 598.60

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1.5x scale

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.