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Finding the Fourth Proportional to 1,195.40, 1,648.50 and 781.32

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Solution

The fourth proportional to 1,195.40, 1,648.50 and 781.32 is: 1,077.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,195.40 : 1,648.50 = 781.32 : x
  2. Step 2: Convert to fraction form
    1,195.40/1,648.50 = 781.32/x
  3. Step 3: Cross multiply
    1,195.40x = 1,648.50 × 781.32
  4. Step 4: Simplify right side
    1,195.40x = 1,288,006.02
  5. Step 5: Solve for x
    x = 1,288,006.02/1,195.40
  6. Step 6: Final answer
    x = 1,077.47

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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.