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Finding the Fourth Proportional to 1,320.84, 1,981.17 and 346.95

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Solution

The fourth proportional to 1,320.84, 1,981.17 and 346.95 is: 520.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.84 : 1,981.17 = 346.95 : x
  2. Step 2: Convert to fraction form
    1,320.84/1,981.17 = 346.95/x
  3. Step 3: Cross multiply
    1,320.84x = 1,981.17 × 346.95
  4. Step 4: Simplify right side
    1,320.84x = 687,366.93
  5. Step 5: Solve for x
    x = 687,366.93/1,320.84
  6. Step 6: Final answer
    x = 520.40

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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.