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Finding the Fourth Proportional to 521.56, 719.68 and 288.72

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Solution

The fourth proportional to 521.56, 719.68 and 288.72 is: 398.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.56 : 719.68 = 288.72 : x
  2. Step 2: Convert to fraction form
    521.56/719.68 = 288.72/x
  3. Step 3: Cross multiply
    521.56x = 719.68 × 288.72
  4. Step 4: Simplify right side
    521.56x = 207,786.01
  5. Step 5: Solve for x
    x = 207,786.01/521.56
  6. Step 6: Final answer
    x = 398.39

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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.