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Finding the Fourth Proportional to 1,359.40, 1,875.70 and 939.09

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Solution

The fourth proportional to 1,359.40, 1,875.70 and 939.09 is: 1,295.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,359.40 : 1,875.70 = 939.09 : x
  2. Step 2: Convert to fraction form
    1,359.40/1,875.70 = 939.09/x
  3. Step 3: Cross multiply
    1,359.40x = 1,875.70 × 939.09
  4. Step 4: Simplify right side
    1,359.40x = 1,761,451.11
  5. Step 5: Solve for x
    x = 1,761,451.11/1,359.40
  6. Step 6: Final answer
    x = 1,295.76

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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.