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Finding the Fourth Proportional to 870.55, 1,200.46 and 605.30

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Solution

The fourth proportional to 870.55, 1,200.46 and 605.30 is: 834.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.55 : 1,200.46 = 605.30 : x
  2. Step 2: Convert to fraction form
    870.55/1,200.46 = 605.30/x
  3. Step 3: Cross multiply
    870.55x = 1,200.46 × 605.30
  4. Step 4: Simplify right side
    870.55x = 726,630.92
  5. Step 5: Solve for x
    x = 726,630.92/870.55
  6. Step 6: Final answer
    x = 834.68

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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.