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Finding the Fourth Proportional to 985.57, 1,359.38 and 631.50

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Solution

The fourth proportional to 985.57, 1,359.38 and 631.50 is: 871.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.57 : 1,359.38 = 631.50 : x
  2. Step 2: Convert to fraction form
    985.57/1,359.38 = 631.50/x
  3. Step 3: Cross multiply
    985.57x = 1,359.38 × 631.50
  4. Step 4: Simplify right side
    985.57x = 858,444.95
  5. Step 5: Solve for x
    x = 858,444.95/985.57
  6. Step 6: Final answer
    x = 871.02

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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.