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Finding the Fourth Proportional to 985.69, 1,478.84 and 437.83

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Solution

The fourth proportional to 985.69, 1,478.84 and 437.83 is: 656.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.69 : 1,478.84 = 437.83 : x
  2. Step 2: Convert to fraction form
    985.69/1,478.84 = 437.83/x
  3. Step 3: Cross multiply
    985.69x = 1,478.84 × 437.83
  4. Step 4: Simplify right side
    985.69x = 647,480.52
  5. Step 5: Solve for x
    x = 647,480.52/985.69
  6. Step 6: Final answer
    x = 656.88

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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.