Home / 1,320.85-1,981.17-540.66

Finding the Fourth Proportional to 1,320.85, 1,981.17 and 540.66

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Solution

The fourth proportional to 1,320.85, 1,981.17 and 540.66 is: 810.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.85 : 1,981.17 = 540.66 : x
  2. Step 2: Convert to fraction form
    1,320.85/1,981.17 = 540.66/x
  3. Step 3: Cross multiply
    1,320.85x = 1,981.17 × 540.66
  4. Step 4: Simplify right side
    1,320.85x = 1,071,139.37
  5. Step 5: Solve for x
    x = 1,071,139.37/1,320.85
  6. Step 6: Final answer
    x = 810.95

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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.