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Finding the Fourth Proportional to 1,320.90, 1,981.46 and 347

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Solution

The fourth proportional to 1,320.90, 1,981.46 and 347 is: 520.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.90 : 1,981.46 = 347 : x
  2. Step 2: Convert to fraction form
    1,320.90/1,981.46 = 347/x
  3. Step 3: Cross multiply
    1,320.90x = 1,981.46 × 347
  4. Step 4: Simplify right side
    1,320.90x = 687,566.62
  5. Step 5: Solve for x
    x = 687,566.62/1,320.90
  6. Step 6: Final answer
    x = 520.53

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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.