Home / 1,320.72-1,981.16-499.11

Finding the Fourth Proportional to 1,320.72, 1,981.16 and 499.11

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Solution

The fourth proportional to 1,320.72, 1,981.16 and 499.11 is: 748.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.72 : 1,981.16 = 499.11 : x
  2. Step 2: Convert to fraction form
    1,320.72/1,981.16 = 499.11/x
  3. Step 3: Cross multiply
    1,320.72x = 1,981.16 × 499.11
  4. Step 4: Simplify right side
    1,320.72x = 988,814.27
  5. Step 5: Solve for x
    x = 988,814.27/1,320.72
  6. Step 6: Final answer
    x = 748.69

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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.