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Finding the Fourth Proportional to 522.68, 721.98 and 391.46

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Solution

The fourth proportional to 522.68, 721.98 and 391.46 is: 540.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.68 : 721.98 = 391.46 : x
  2. Step 2: Convert to fraction form
    522.68/721.98 = 391.46/x
  3. Step 3: Cross multiply
    522.68x = 721.98 × 391.46
  4. Step 4: Simplify right side
    522.68x = 282,626.29
  5. Step 5: Solve for x
    x = 282,626.29/522.68
  6. Step 6: Final answer
    x = 540.73

Related Problems

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.