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Finding the Fourth Proportional to 1,285.79, 1,773.99 and 787.91

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Solution

The fourth proportional to 1,285.79, 1,773.99 and 787.91 is: 1,087.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.79 : 1,773.99 = 787.91 : x
  2. Step 2: Convert to fraction form
    1,285.79/1,773.99 = 787.91/x
  3. Step 3: Cross multiply
    1,285.79x = 1,773.99 × 787.91
  4. Step 4: Simplify right side
    1,285.79x = 1,397,744.46
  5. Step 5: Solve for x
    x = 1,397,744.46/1,285.79
  6. Step 6: Final answer
    x = 1,087.07

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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.