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Finding the Fourth Proportional to 985.12, 1,358.90 and 591.91

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Solution

The fourth proportional to 985.12, 1,358.90 and 591.91 is: 816.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.12 : 1,358.90 = 591.91 : x
  2. Step 2: Convert to fraction form
    985.12/1,358.90 = 591.91/x
  3. Step 3: Cross multiply
    985.12x = 1,358.90 × 591.91
  4. Step 4: Simplify right side
    985.12x = 804,336.74
  5. Step 5: Solve for x
    x = 804,336.74/985.12
  6. Step 6: Final answer
    x = 816.49

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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.