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Finding the Fourth Proportional to 765.38, 1,056.24 and 416.09

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Solution

The fourth proportional to 765.38, 1,056.24 and 416.09 is: 574.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.38 : 1,056.24 = 416.09 : x
  2. Step 2: Convert to fraction form
    765.38/1,056.24 = 416.09/x
  3. Step 3: Cross multiply
    765.38x = 1,056.24 × 416.09
  4. Step 4: Simplify right side
    765.38x = 439,485.62
  5. Step 5: Solve for x
    x = 439,485.62/765.38
  6. Step 6: Final answer
    x = 574.21

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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.