Home / 1,108.18-1,528.69-812.78

Finding the Fourth Proportional to 1,108.18, 1,528.69 and 812.78

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Solution

The fourth proportional to 1,108.18, 1,528.69 and 812.78 is: 1,121.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.18 : 1,528.69 = 812.78 : x
  2. Step 2: Convert to fraction form
    1,108.18/1,528.69 = 812.78/x
  3. Step 3: Cross multiply
    1,108.18x = 1,528.69 × 812.78
  4. Step 4: Simplify right side
    1,108.18x = 1,242,488.66
  5. Step 5: Solve for x
    x = 1,242,488.66/1,108.18
  6. Step 6: Final answer
    x = 1,121.20

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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.