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Finding the Fourth Proportional to 1,387.17, 1,914.33 and 797.76

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Solution

The fourth proportional to 1,387.17, 1,914.33 and 797.76 is: 1,100.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.17 : 1,914.33 = 797.76 : x
  2. Step 2: Convert to fraction form
    1,387.17/1,914.33 = 797.76/x
  3. Step 3: Cross multiply
    1,387.17x = 1,914.33 × 797.76
  4. Step 4: Simplify right side
    1,387.17x = 1,527,175.90
  5. Step 5: Solve for x
    x = 1,527,175.90/1,387.17
  6. Step 6: Final answer
    x = 1,100.93

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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.