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Finding the Fourth Proportional to 718.13, 1,074.36 and 513.20

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Solution

The fourth proportional to 718.13, 1,074.36 and 513.20 is: 767.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.13 : 1,074.36 = 513.20 : x
  2. Step 2: Convert to fraction form
    718.13/1,074.36 = 513.20/x
  3. Step 3: Cross multiply
    718.13x = 1,074.36 × 513.20
  4. Step 4: Simplify right side
    718.13x = 551,364.24
  5. Step 5: Solve for x
    x = 551,364.24/718.13
  6. Step 6: Final answer
    x = 767.78

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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.