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Finding the Fourth Proportional to 1,125.42, 1,686.81 and 778.86

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Solution

The fourth proportional to 1,125.42, 1,686.81 and 778.86 is: 1,167.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.42 : 1,686.81 = 778.86 : x
  2. Step 2: Convert to fraction form
    1,125.42/1,686.81 = 778.86/x
  3. Step 3: Cross multiply
    1,125.42x = 1,686.81 × 778.86
  4. Step 4: Simplify right side
    1,125.42x = 1,313,788.84
  5. Step 5: Solve for x
    x = 1,313,788.84/1,125.42
  6. Step 6: Final answer
    x = 1,167.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.