Home / 1,291.46-1,778.06-1,125.68

Finding the Fourth Proportional to 1,291.46, 1,778.06 and 1,125.68

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Solution

The fourth proportional to 1,291.46, 1,778.06 and 1,125.68 is: 1,549.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.46 : 1,778.06 = 1,125.68 : x
  2. Step 2: Convert to fraction form
    1,291.46/1,778.06 = 1,125.68/x
  3. Step 3: Cross multiply
    1,291.46x = 1,778.06 × 1,125.68
  4. Step 4: Simplify right side
    1,291.46x = 2,001,520.50
  5. Step 5: Solve for x
    x = 2,001,520.50/1,291.46
  6. Step 6: Final answer
    x = 1,549.82

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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.