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Finding the Fourth Proportional to 797.65, 1,100.24 and 487.15

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Solution

The fourth proportional to 797.65, 1,100.24 and 487.15 is: 671.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    797.65 : 1,100.24 = 487.15 : x
  2. Step 2: Convert to fraction form
    797.65/1,100.24 = 487.15/x
  3. Step 3: Cross multiply
    797.65x = 1,100.24 × 487.15
  4. Step 4: Simplify right side
    797.65x = 535,981.92
  5. Step 5: Solve for x
    x = 535,981.92/797.65
  6. Step 6: Final answer
    x = 671.95

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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.