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Finding the Fourth Proportional to 721.49, 1,082.18 and 288.67

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Solution

The fourth proportional to 721.49, 1,082.18 and 288.67 is: 432.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.49 : 1,082.18 = 288.67 : x
  2. Step 2: Convert to fraction form
    721.49/1,082.18 = 288.67/x
  3. Step 3: Cross multiply
    721.49x = 1,082.18 × 288.67
  4. Step 4: Simplify right side
    721.49x = 312,391.46
  5. Step 5: Solve for x
    x = 312,391.46/721.49
  6. Step 6: Final answer
    x = 432.98

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1.5x scale

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.