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Finding the Fourth Proportional to 630.82, 870.24 and 455.86

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Solution

The fourth proportional to 630.82, 870.24 and 455.86 is: 628.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.82 : 870.24 = 455.86 : x
  2. Step 2: Convert to fraction form
    630.82/870.24 = 455.86/x
  3. Step 3: Cross multiply
    630.82x = 870.24 × 455.86
  4. Step 4: Simplify right side
    630.82x = 396,707.61
  5. Step 5: Solve for x
    x = 396,707.61/630.82
  6. Step 6: Final answer
    x = 628.88

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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.