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Finding the Fourth Proportional to 1,101.95, 1,521.21 and 787.87

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Solution

The fourth proportional to 1,101.95, 1,521.21 and 787.87 is: 1,087.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,101.95 : 1,521.21 = 787.87 : x
  2. Step 2: Convert to fraction form
    1,101.95/1,521.21 = 787.87/x
  3. Step 3: Cross multiply
    1,101.95x = 1,521.21 × 787.87
  4. Step 4: Simplify right side
    1,101.95x = 1,198,515.72
  5. Step 5: Solve for x
    x = 1,198,515.72/1,101.95
  6. Step 6: Final answer
    x = 1,087.63

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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.