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Finding the Fourth Proportional to 1,207.80, 1,667.05 and 787.42

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Solution

The fourth proportional to 1,207.80, 1,667.05 and 787.42 is: 1,086.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.80 : 1,667.05 = 787.42 : x
  2. Step 2: Convert to fraction form
    1,207.80/1,667.05 = 787.42/x
  3. Step 3: Cross multiply
    1,207.80x = 1,667.05 × 787.42
  4. Step 4: Simplify right side
    1,207.80x = 1,312,664.57
  5. Step 5: Solve for x
    x = 1,312,664.57/1,207.80
  6. Step 6: Final answer
    x = 1,086.82

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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.