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Finding the Fourth Proportional to 869.61, 1,200.05 and 496.70

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Solution

The fourth proportional to 869.61, 1,200.05 and 496.70 is: 685.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.61 : 1,200.05 = 496.70 : x
  2. Step 2: Convert to fraction form
    869.61/1,200.05 = 496.70/x
  3. Step 3: Cross multiply
    869.61x = 1,200.05 × 496.70
  4. Step 4: Simplify right side
    869.61x = 596,069.08
  5. Step 5: Solve for x
    x = 596,069.08/869.61
  6. Step 6: Final answer
    x = 685.45

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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.