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Finding the Fourth Proportional to 765.48, 1,056.11 and 470.64

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Solution

The fourth proportional to 765.48, 1,056.11 and 470.64 is: 649.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.48 : 1,056.11 = 470.64 : x
  2. Step 2: Convert to fraction form
    765.48/1,056.11 = 470.64/x
  3. Step 3: Cross multiply
    765.48x = 1,056.11 × 470.64
  4. Step 4: Simplify right side
    765.48x = 497,045.26
  5. Step 5: Solve for x
    x = 497,045.26/765.48
  6. Step 6: Final answer
    x = 649.32

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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.