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Finding the Fourth Proportional to 500.48, 751.40 and 318.70

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Solution

The fourth proportional to 500.48, 751.40 and 318.70 is: 478.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.48 : 751.40 = 318.70 : x
  2. Step 2: Convert to fraction form
    500.48/751.40 = 318.70/x
  3. Step 3: Cross multiply
    500.48x = 751.40 × 318.70
  4. Step 4: Simplify right side
    500.48x = 239,471.18
  5. Step 5: Solve for x
    x = 239,471.18/500.48
  6. Step 6: Final answer
    x = 478.48

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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.