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Finding the Fourth Proportional to 1,340.70, 1,850 and 781.27

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Solution

The fourth proportional to 1,340.70, 1,850 and 781.27 is: 1,078.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,340.70 : 1,850 = 781.27 : x
  2. Step 2: Convert to fraction form
    1,340.70/1,850 = 781.27/x
  3. Step 3: Cross multiply
    1,340.70x = 1,850 × 781.27
  4. Step 4: Simplify right side
    1,340.70x = 1,445,349.50
  5. Step 5: Solve for x
    x = 1,445,349.50/1,340.70
  6. Step 6: Final answer
    x = 1,078.06

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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.