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Finding the Fourth Proportional to 765.73, 1,056.70 and 416.42

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Solution

The fourth proportional to 765.73, 1,056.70 and 416.42 is: 574.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.73 : 1,056.70 = 416.42 : x
  2. Step 2: Convert to fraction form
    765.73/1,056.70 = 416.42/x
  3. Step 3: Cross multiply
    765.73x = 1,056.70 × 416.42
  4. Step 4: Simplify right side
    765.73x = 440,025.73
  5. Step 5: Solve for x
    x = 440,025.73/765.73
  6. Step 6: Final answer
    x = 574.65

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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.