Home / 1,320.25-1,981.58-540.80

Finding the Fourth Proportional to 1,320.25, 1,981.58 and 540.80

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Solution

The fourth proportional to 1,320.25, 1,981.58 and 540.80 is: 811.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.25 : 1,981.58 = 540.80 : x
  2. Step 2: Convert to fraction form
    1,320.25/1,981.58 = 540.80/x
  3. Step 3: Cross multiply
    1,320.25x = 1,981.58 × 540.80
  4. Step 4: Simplify right side
    1,320.25x = 1,071,638.46
  5. Step 5: Solve for x
    x = 1,071,638.46/1,320.25
  6. Step 6: Final answer
    x = 811.69

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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.