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Finding the Fourth Proportional to 521.48, 719.60 and 288.60

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Solution

The fourth proportional to 521.48, 719.60 and 288.60 is: 398.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.48 : 719.60 = 288.60 : x
  2. Step 2: Convert to fraction form
    521.48/719.60 = 288.60/x
  3. Step 3: Cross multiply
    521.48x = 719.60 × 288.60
  4. Step 4: Simplify right side
    521.48x = 207,676.56
  5. Step 5: Solve for x
    x = 207,676.56/521.48
  6. Step 6: Final answer
    x = 398.24

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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.