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Finding the Fourth Proportional to 630.13, 869.65 and 381.53

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Solution

The fourth proportional to 630.13, 869.65 and 381.53 is: 526.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.13 : 869.65 = 381.53 : x
  2. Step 2: Convert to fraction form
    630.13/869.65 = 381.53/x
  3. Step 3: Cross multiply
    630.13x = 869.65 × 381.53
  4. Step 4: Simplify right side
    630.13x = 331,797.56
  5. Step 5: Solve for x
    x = 331,797.56/630.13
  6. Step 6: Final answer
    x = 526.56

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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.