Home / 1,127.20-1,690.80-396.78

Finding the Fourth Proportional to 1,127.20, 1,690.80 and 396.78

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Solution

The fourth proportional to 1,127.20, 1,690.80 and 396.78 is: 595.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.20 : 1,690.80 = 396.78 : x
  2. Step 2: Convert to fraction form
    1,127.20/1,690.80 = 396.78/x
  3. Step 3: Cross multiply
    1,127.20x = 1,690.80 × 396.78
  4. Step 4: Simplify right side
    1,127.20x = 670,875.62
  5. Step 5: Solve for x
    x = 670,875.62/1,127.20
  6. Step 6: Final answer
    x = 595.17

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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.