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Finding the Fourth Proportional to 985.22, 1,478.34 and 437.79

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Solution

The fourth proportional to 985.22, 1,478.34 and 437.79 is: 656.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.22 : 1,478.34 = 437.79 : x
  2. Step 2: Convert to fraction form
    985.22/1,478.34 = 437.79/x
  3. Step 3: Cross multiply
    985.22x = 1,478.34 × 437.79
  4. Step 4: Simplify right side
    985.22x = 647,202.47
  5. Step 5: Solve for x
    x = 647,202.47/985.22
  6. Step 6: Final answer
    x = 656.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.