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Finding the Fourth Proportional to 520.75, 719.22 and 354.70

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Solution

The fourth proportional to 520.75, 719.22 and 354.70 is: 489.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.75 : 719.22 = 354.70 : x
  2. Step 2: Convert to fraction form
    520.75/719.22 = 354.70/x
  3. Step 3: Cross multiply
    520.75x = 719.22 × 354.70
  4. Step 4: Simplify right side
    520.75x = 255,107.33
  5. Step 5: Solve for x
    x = 255,107.33/520.75
  6. Step 6: Final answer
    x = 489.88

Related Problems

Find fourth proportional to 260.38, 359.61 and 177.35
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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.