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Finding the Fourth Proportional to 765.55, 1,055.52 and 647.31

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Solution

The fourth proportional to 765.55, 1,055.52 and 647.31 is: 892.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.55 : 1,055.52 = 647.31 : x
  2. Step 2: Convert to fraction form
    765.55/1,055.52 = 647.31/x
  3. Step 3: Cross multiply
    765.55x = 1,055.52 × 647.31
  4. Step 4: Simplify right side
    765.55x = 683,248.65
  5. Step 5: Solve for x
    x = 683,248.65/765.55
  6. Step 6: Final answer
    x = 892.49

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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.