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Finding the Fourth Proportional to 478.48, 716.50 and 315.67

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Solution

The fourth proportional to 478.48, 716.50 and 315.67 is: 472.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.48 : 716.50 = 315.67 : x
  2. Step 2: Convert to fraction form
    478.48/716.50 = 315.67/x
  3. Step 3: Cross multiply
    478.48x = 716.50 × 315.67
  4. Step 4: Simplify right side
    478.48x = 226,177.56
  5. Step 5: Solve for x
    x = 226,177.56/478.48
  6. Step 6: Final answer
    x = 472.70

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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.