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Finding the Fourth Proportional to 521.57, 719.73 and 288.69

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Solution

The fourth proportional to 521.57, 719.73 and 288.69 is: 398.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.57 : 719.73 = 288.69 : x
  2. Step 2: Convert to fraction form
    521.57/719.73 = 288.69/x
  3. Step 3: Cross multiply
    521.57x = 719.73 × 288.69
  4. Step 4: Simplify right side
    521.57x = 207,778.85
  5. Step 5: Solve for x
    x = 207,778.85/521.57
  6. Step 6: Final answer
    x = 398.37

Related Problems

Find fourth proportional to 260.79, 359.87 and 144.35
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Double scale
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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.