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Finding the Fourth Proportional to 440.68, 660.48 and 386.68

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Solution

The fourth proportional to 440.68, 660.48 and 386.68 is: 579.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.68 : 660.48 = 386.68 : x
  2. Step 2: Convert to fraction form
    440.68/660.48 = 386.68/x
  3. Step 3: Cross multiply
    440.68x = 660.48 × 386.68
  4. Step 4: Simplify right side
    440.68x = 255,394.41
  5. Step 5: Solve for x
    x = 255,394.41/440.68
  6. Step 6: Final answer
    x = 579.55

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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.