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Finding the Fourth Proportional to 765.12, 1,055.53 and 470.22

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Solution

The fourth proportional to 765.12, 1,055.53 and 470.22 is: 648.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.12 : 1,055.53 = 470.22 : x
  2. Step 2: Convert to fraction form
    765.12/1,055.53 = 470.22/x
  3. Step 3: Cross multiply
    765.12x = 1,055.53 × 470.22
  4. Step 4: Simplify right side
    765.12x = 496,331.32
  5. Step 5: Solve for x
    x = 496,331.32/765.12
  6. Step 6: Final answer
    x = 648.70

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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.