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Finding the Fourth Proportional to 1,437.12, 1,983.44 and 939.68

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Solution

The fourth proportional to 1,437.12, 1,983.44 and 939.68 is: 1,296.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,437.12 : 1,983.44 = 939.68 : x
  2. Step 2: Convert to fraction form
    1,437.12/1,983.44 = 939.68/x
  3. Step 3: Cross multiply
    1,437.12x = 1,983.44 × 939.68
  4. Step 4: Simplify right side
    1,437.12x = 1,863,798.90
  5. Step 5: Solve for x
    x = 1,863,798.90/1,437.12
  6. Step 6: Final answer
    x = 1,296.90

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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.