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Finding the Fourth Proportional to 440.40, 661.38 and 248.16

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Solution

The fourth proportional to 440.40, 661.38 and 248.16 is: 372.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.40 : 661.38 = 248.16 : x
  2. Step 2: Convert to fraction form
    440.40/661.38 = 248.16/x
  3. Step 3: Cross multiply
    440.40x = 661.38 × 248.16
  4. Step 4: Simplify right side
    440.40x = 164,128.06
  5. Step 5: Solve for x
    x = 164,128.06/440.40
  6. Step 6: Final answer
    x = 372.68

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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.