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Finding the Fourth Proportional to 630.59, 869.72 and 381.57

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Solution

The fourth proportional to 630.59, 869.72 and 381.57 is: 526.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.59 : 869.72 = 381.57 : x
  2. Step 2: Convert to fraction form
    630.59/869.72 = 381.57/x
  3. Step 3: Cross multiply
    630.59x = 869.72 × 381.57
  4. Step 4: Simplify right side
    630.59x = 331,857.15
  5. Step 5: Solve for x
    x = 331,857.15/630.59
  6. Step 6: Final answer
    x = 526.27

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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.