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Finding the Fourth Proportional to 521.64, 719.84 and 285.60

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Solution

The fourth proportional to 521.64, 719.84 and 285.60 is: 394.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.64 : 719.84 = 285.60 : x
  2. Step 2: Convert to fraction form
    521.64/719.84 = 285.60/x
  3. Step 3: Cross multiply
    521.64x = 719.84 × 285.60
  4. Step 4: Simplify right side
    521.64x = 205,586.30
  5. Step 5: Solve for x
    x = 205,586.30/521.64
  6. Step 6: Final answer
    x = 394.12

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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.