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Finding the Fourth Proportional to 985.12, 1,359.18 and 631.24

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Solution

The fourth proportional to 985.12, 1,359.18 and 631.24 is: 870.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.12 : 1,359.18 = 631.24 : x
  2. Step 2: Convert to fraction form
    985.12/1,359.18 = 631.24/x
  3. Step 3: Cross multiply
    985.12x = 1,359.18 × 631.24
  4. Step 4: Simplify right side
    985.12x = 857,968.78
  5. Step 5: Solve for x
    x = 857,968.78/985.12
  6. Step 6: Final answer
    x = 870.93

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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.