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Finding the Fourth Proportional to 499.48, 749.90 and 317.70

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Solution

The fourth proportional to 499.48, 749.90 and 317.70 is: 476.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.48 : 749.90 = 317.70 : x
  2. Step 2: Convert to fraction form
    499.48/749.90 = 317.70/x
  3. Step 3: Cross multiply
    499.48x = 749.90 × 317.70
  4. Step 4: Simplify right side
    499.48x = 238,243.23
  5. Step 5: Solve for x
    x = 238,243.23/499.48
  6. Step 6: Final answer
    x = 476.98

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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.