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Finding the Fourth Proportional to 521.64, 719.84 and 288.76

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Solution

The fourth proportional to 521.64, 719.84 and 288.76 is: 398.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.64 : 719.84 = 288.76 : x
  2. Step 2: Convert to fraction form
    521.64/719.84 = 288.76/x
  3. Step 3: Cross multiply
    521.64x = 719.84 × 288.76
  4. Step 4: Simplify right side
    521.64x = 207,861.00
  5. Step 5: Solve for x
    x = 207,861.00/521.64
  6. Step 6: Final answer
    x = 398.48

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.