Home / 1,180.18-1,628.95-781.66

Finding the Fourth Proportional to 1,180.18, 1,628.95 and 781.66

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Solution

The fourth proportional to 1,180.18, 1,628.95 and 781.66 is: 1,078.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.18 : 1,628.95 = 781.66 : x
  2. Step 2: Convert to fraction form
    1,180.18/1,628.95 = 781.66/x
  3. Step 3: Cross multiply
    1,180.18x = 1,628.95 × 781.66
  4. Step 4: Simplify right side
    1,180.18x = 1,273,285.06
  5. Step 5: Solve for x
    x = 1,273,285.06/1,180.18
  6. Step 6: Final answer
    x = 1,078.89

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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.