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Finding the Fourth Proportional to 1,320.72, 1,981 and 346.82

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Solution

The fourth proportional to 1,320.72, 1,981 and 346.82 is: 520.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.72 : 1,981 = 346.82 : x
  2. Step 2: Convert to fraction form
    1,320.72/1,981 = 346.82/x
  3. Step 3: Cross multiply
    1,320.72x = 1,981 × 346.82
  4. Step 4: Simplify right side
    1,320.72x = 687,050.42
  5. Step 5: Solve for x
    x = 687,050.42/1,320.72
  6. Step 6: Final answer
    x = 520.21

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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.