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Finding the Fourth Proportional to 631.65, 869.54 and 520.95

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Solution

The fourth proportional to 631.65, 869.54 and 520.95 is: 717.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.65 : 869.54 = 520.95 : x
  2. Step 2: Convert to fraction form
    631.65/869.54 = 520.95/x
  3. Step 3: Cross multiply
    631.65x = 869.54 × 520.95
  4. Step 4: Simplify right side
    631.65x = 452,986.86
  5. Step 5: Solve for x
    x = 452,986.86/631.65
  6. Step 6: Final answer
    x = 717.15

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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.