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Finding the Fourth Proportional to 440.35, 659.61 and 257.19

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Solution

The fourth proportional to 440.35, 659.61 and 257.19 is: 385.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.35 : 659.61 = 257.19 : x
  2. Step 2: Convert to fraction form
    440.35/659.61 = 257.19/x
  3. Step 3: Cross multiply
    440.35x = 659.61 × 257.19
  4. Step 4: Simplify right side
    440.35x = 169,642.62
  5. Step 5: Solve for x
    x = 169,642.62/440.35
  6. Step 6: Final answer
    x = 385.25

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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.