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Finding the Fourth Proportional to 1,252.90, 1,728.99 and 787.06

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Solution

The fourth proportional to 1,252.90, 1,728.99 and 787.06 is: 1,086.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.90 : 1,728.99 = 787.06 : x
  2. Step 2: Convert to fraction form
    1,252.90/1,728.99 = 787.06/x
  3. Step 3: Cross multiply
    1,252.90x = 1,728.99 × 787.06
  4. Step 4: Simplify right side
    1,252.90x = 1,360,818.87
  5. Step 5: Solve for x
    x = 1,360,818.87/1,252.90
  6. Step 6: Final answer
    x = 1,086.14

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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.