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Finding the Fourth Proportional to 522.75, 721.41 and 289.89

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Solution

The fourth proportional to 522.75, 721.41 and 289.89 is: 400.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.75 : 721.41 = 289.89 : x
  2. Step 2: Convert to fraction form
    522.75/721.41 = 289.89/x
  3. Step 3: Cross multiply
    522.75x = 721.41 × 289.89
  4. Step 4: Simplify right side
    522.75x = 209,129.54
  5. Step 5: Solve for x
    x = 209,129.54/522.75
  6. Step 6: Final answer
    x = 400.06

Related Problems

Find fourth proportional to 261.38, 360.71 and 144.95
Half scale
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Double scale
Find fourth proportional to 523.75, 722.79 and 290.89
Similar ratio
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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.