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Finding the Fourth Proportional to 630.70, 944.70 and 387.70

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Solution

The fourth proportional to 630.70, 944.70 and 387.70 is: 580.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.70 : 944.70 = 387.70 : x
  2. Step 2: Convert to fraction form
    630.70/944.70 = 387.70/x
  3. Step 3: Cross multiply
    630.70x = 944.70 × 387.70
  4. Step 4: Simplify right side
    630.70x = 366,260.19
  5. Step 5: Solve for x
    x = 366,260.19/630.70
  6. Step 6: Final answer
    x = 580.72

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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.