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Finding the Fourth Proportional to 978.11, 1,465.78 and 514.95

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Solution

The fourth proportional to 978.11, 1,465.78 and 514.95 is: 771.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.11 : 1,465.78 = 514.95 : x
  2. Step 2: Convert to fraction form
    978.11/1,465.78 = 514.95/x
  3. Step 3: Cross multiply
    978.11x = 1,465.78 × 514.95
  4. Step 4: Simplify right side
    978.11x = 754,805.84
  5. Step 5: Solve for x
    x = 754,805.84/978.11
  6. Step 6: Final answer
    x = 771.70

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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.