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Finding the Fourth Proportional to 440.34, 660.81 and 405.15

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Solution

The fourth proportional to 440.34, 660.81 and 405.15 is: 608.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.34 : 660.81 = 405.15 : x
  2. Step 2: Convert to fraction form
    440.34/660.81 = 405.15/x
  3. Step 3: Cross multiply
    440.34x = 660.81 × 405.15
  4. Step 4: Simplify right side
    440.34x = 267,727.17
  5. Step 5: Solve for x
    x = 267,727.17/440.34
  6. Step 6: Final answer
    x = 608.00

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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.