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Finding the Fourth Proportional to 978.66, 1,465.39 and 765.46

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Solution

The fourth proportional to 978.66, 1,465.39 and 765.46 is: 1,146.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.66 : 1,465.39 = 765.46 : x
  2. Step 2: Convert to fraction form
    978.66/1,465.39 = 765.46/x
  3. Step 3: Cross multiply
    978.66x = 1,465.39 × 765.46
  4. Step 4: Simplify right side
    978.66x = 1,121,691.85
  5. Step 5: Solve for x
    x = 1,121,691.85/978.66
  6. Step 6: Final answer
    x = 1,146.15

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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.