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Finding the Fourth Proportional to 488.70, 731.70 and 475.20

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Solution

The fourth proportional to 488.70, 731.70 and 475.20 is: 711.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.70 : 731.70 = 475.20 : x
  2. Step 2: Convert to fraction form
    488.70/731.70 = 475.20/x
  3. Step 3: Cross multiply
    488.70x = 731.70 × 475.20
  4. Step 4: Simplify right side
    488.70x = 347,703.84
  5. Step 5: Solve for x
    x = 347,703.84/488.70
  6. Step 6: Final answer
    x = 711.49

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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.