Home / 1,320.76-1,981.01-346.78

Finding the Fourth Proportional to 1,320.76, 1,981.01 and 346.78

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Solution

The fourth proportional to 1,320.76, 1,981.01 and 346.78 is: 520.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.76 : 1,981.01 = 346.78 : x
  2. Step 2: Convert to fraction form
    1,320.76/1,981.01 = 346.78/x
  3. Step 3: Cross multiply
    1,320.76x = 1,981.01 × 346.78
  4. Step 4: Simplify right side
    1,320.76x = 686,972.91
  5. Step 5: Solve for x
    x = 686,972.91/1,320.76
  6. Step 6: Final answer
    x = 520.13

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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.