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Finding the Fourth Proportional to 985.17, 1,359.52 and 635.86

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Solution

The fourth proportional to 985.17, 1,359.52 and 635.86 is: 877.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.17 : 1,359.52 = 635.86 : x
  2. Step 2: Convert to fraction form
    985.17/1,359.52 = 635.86/x
  3. Step 3: Cross multiply
    985.17x = 1,359.52 × 635.86
  4. Step 4: Simplify right side
    985.17x = 864,464.50
  5. Step 5: Solve for x
    x = 864,464.50/985.17
  6. Step 6: Final answer
    x = 877.47

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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.