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Finding the Fourth Proportional to 765.66, 1,146.06 and 649.02

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Solution

The fourth proportional to 765.66, 1,146.06 and 649.02 is: 971.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.66 : 1,146.06 = 649.02 : x
  2. Step 2: Convert to fraction form
    765.66/1,146.06 = 649.02/x
  3. Step 3: Cross multiply
    765.66x = 1,146.06 × 649.02
  4. Step 4: Simplify right side
    765.66x = 743,815.86
  5. Step 5: Solve for x
    x = 743,815.86/765.66
  6. Step 6: Final answer
    x = 971.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.