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Finding the Fourth Proportional to 630.70, 870.38 and 381.98

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Solution

The fourth proportional to 630.70, 870.38 and 381.98 is: 527.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.70 : 870.38 = 381.98 : x
  2. Step 2: Convert to fraction form
    630.70/870.38 = 381.98/x
  3. Step 3: Cross multiply
    630.70x = 870.38 × 381.98
  4. Step 4: Simplify right side
    630.70x = 332,467.75
  5. Step 5: Solve for x
    x = 332,467.75/630.70
  6. Step 6: Final answer
    x = 527.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.