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Finding the Fourth Proportional to 440.58, 660.15 and 257.88

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Solution

The fourth proportional to 440.58, 660.15 and 257.88 is: 386.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.58 : 660.15 = 257.88 : x
  2. Step 2: Convert to fraction form
    440.58/660.15 = 257.88/x
  3. Step 3: Cross multiply
    440.58x = 660.15 × 257.88
  4. Step 4: Simplify right side
    440.58x = 170,239.48
  5. Step 5: Solve for x
    x = 170,239.48/440.58
  6. Step 6: Final answer
    x = 386.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.