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Finding the Fourth Proportional to 1,137.60, 1,569.24 and 787.68

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Solution

The fourth proportional to 1,137.60, 1,569.24 and 787.68 is: 1,086.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.60 : 1,569.24 = 787.68 : x
  2. Step 2: Convert to fraction form
    1,137.60/1,569.24 = 787.68/x
  3. Step 3: Cross multiply
    1,137.60x = 1,569.24 × 787.68
  4. Step 4: Simplify right side
    1,137.60x = 1,236,058.96
  5. Step 5: Solve for x
    x = 1,236,058.96/1,137.60
  6. Step 6: Final answer
    x = 1,086.55

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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.