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Finding the Fourth Proportional to 723.20, 1,086.40 and 507.20

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Solution

The fourth proportional to 723.20, 1,086.40 and 507.20 is: 761.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.20 : 1,086.40 = 507.20 : x
  2. Step 2: Convert to fraction form
    723.20/1,086.40 = 507.20/x
  3. Step 3: Cross multiply
    723.20x = 1,086.40 × 507.20
  4. Step 4: Simplify right side
    723.20x = 551,022.08
  5. Step 5: Solve for x
    x = 551,022.08/723.20
  6. Step 6: Final answer
    x = 761.92

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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.