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Finding the Fourth Proportional to 985.94, 1,478.91 and 437.97

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Solution

The fourth proportional to 985.94, 1,478.91 and 437.97 is: 656.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.94 : 1,478.91 = 437.97 : x
  2. Step 2: Convert to fraction form
    985.94/1,478.91 = 437.97/x
  3. Step 3: Cross multiply
    985.94x = 1,478.91 × 437.97
  4. Step 4: Simplify right side
    985.94x = 647,718.21
  5. Step 5: Solve for x
    x = 647,718.21/985.94
  6. Step 6: Final answer
    x = 656.96

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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.