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Finding the Fourth Proportional to 522.76, 720.81 and 391.54

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Solution

The fourth proportional to 522.76, 720.81 and 391.54 is: 539.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.76 : 720.81 = 391.54 : x
  2. Step 2: Convert to fraction form
    522.76/720.81 = 391.54/x
  3. Step 3: Cross multiply
    522.76x = 720.81 × 391.54
  4. Step 4: Simplify right side
    522.76x = 282,225.95
  5. Step 5: Solve for x
    x = 282,225.95/522.76
  6. Step 6: Final answer
    x = 539.88

Related Problems

Find fourth proportional to 261.38, 360.41 and 195.77
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Double scale
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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.