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Finding the Fourth Proportional to 765.12, 1,055.36 and 470.56

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Solution

The fourth proportional to 765.12, 1,055.36 and 470.56 is: 649.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.12 : 1,055.36 = 470.56 : x
  2. Step 2: Convert to fraction form
    765.12/1,055.36 = 470.56/x
  3. Step 3: Cross multiply
    765.12x = 1,055.36 × 470.56
  4. Step 4: Simplify right side
    765.12x = 496,610.20
  5. Step 5: Solve for x
    x = 496,610.20/765.12
  6. Step 6: Final answer
    x = 649.06

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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.