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Finding the Fourth Proportional to 938.73, 1,295.81 and 840.31

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Solution

The fourth proportional to 938.73, 1,295.81 and 840.31 is: 1,159.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.73 : 1,295.81 = 840.31 : x
  2. Step 2: Convert to fraction form
    938.73/1,295.81 = 840.31/x
  3. Step 3: Cross multiply
    938.73x = 1,295.81 × 840.31
  4. Step 4: Simplify right side
    938.73x = 1,088,882.10
  5. Step 5: Solve for x
    x = 1,088,882.10/938.73
  6. Step 6: Final answer
    x = 1,159.95

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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.