Home / 1,320.69-1,981.48-499.20

Finding the Fourth Proportional to 1,320.69, 1,981.48 and 499.20

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Solution

The fourth proportional to 1,320.69, 1,981.48 and 499.20 is: 748.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.69 : 1,981.48 = 499.20 : x
  2. Step 2: Convert to fraction form
    1,320.69/1,981.48 = 499.20/x
  3. Step 3: Cross multiply
    1,320.69x = 1,981.48 × 499.20
  4. Step 4: Simplify right side
    1,320.69x = 989,154.82
  5. Step 5: Solve for x
    x = 989,154.82/1,320.69
  6. Step 6: Final answer
    x = 748.97

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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.