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Finding the Fourth Proportional to 1,291.41, 1,782.15 and 787.12

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Solution

The fourth proportional to 1,291.41, 1,782.15 and 787.12 is: 1,086.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.41 : 1,782.15 = 787.12 : x
  2. Step 2: Convert to fraction form
    1,291.41/1,782.15 = 787.12/x
  3. Step 3: Cross multiply
    1,291.41x = 1,782.15 × 787.12
  4. Step 4: Simplify right side
    1,291.41x = 1,402,765.91
  5. Step 5: Solve for x
    x = 1,402,765.91/1,291.41
  6. Step 6: Final answer
    x = 1,086.23

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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.