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Finding the Fourth Proportional to 1,253.52, 1,730.34 and 787.68

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Solution

The fourth proportional to 1,253.52, 1,730.34 and 787.68 is: 1,087.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.52 : 1,730.34 = 787.68 : x
  2. Step 2: Convert to fraction form
    1,253.52/1,730.34 = 787.68/x
  3. Step 3: Cross multiply
    1,253.52x = 1,730.34 × 787.68
  4. Step 4: Simplify right side
    1,253.52x = 1,362,954.21
  5. Step 5: Solve for x
    x = 1,362,954.21/1,253.52
  6. Step 6: Final answer
    x = 1,087.30

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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.