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Finding the Fourth Proportional to 1,377.66, 1,901.17 and 788.20

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Solution

The fourth proportional to 1,377.66, 1,901.17 and 788.20 is: 1,087.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.66 : 1,901.17 = 788.20 : x
  2. Step 2: Convert to fraction form
    1,377.66/1,901.17 = 788.20/x
  3. Step 3: Cross multiply
    1,377.66x = 1,901.17 × 788.20
  4. Step 4: Simplify right side
    1,377.66x = 1,498,502.19
  5. Step 5: Solve for x
    x = 1,498,502.19/1,377.66
  6. Step 6: Final answer
    x = 1,087.72

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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.