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Finding the Fourth Proportional to 878.20, 1,316.88 and 513.10

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Solution

The fourth proportional to 878.20, 1,316.88 and 513.10 is: 769.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.20 : 1,316.88 = 513.10 : x
  2. Step 2: Convert to fraction form
    878.20/1,316.88 = 513.10/x
  3. Step 3: Cross multiply
    878.20x = 1,316.88 × 513.10
  4. Step 4: Simplify right side
    878.20x = 675,691.13
  5. Step 5: Solve for x
    x = 675,691.13/878.20
  6. Step 6: Final answer
    x = 769.40

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1.5x scale

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.