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Finding the Fourth Proportional to 440.40, 661.14 and 412.32

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Solution

The fourth proportional to 440.40, 661.14 and 412.32 is: 618.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.40 : 661.14 = 412.32 : x
  2. Step 2: Convert to fraction form
    440.40/661.14 = 412.32/x
  3. Step 3: Cross multiply
    440.40x = 661.14 × 412.32
  4. Step 4: Simplify right side
    440.40x = 272,601.24
  5. Step 5: Solve for x
    x = 272,601.24/440.40
  6. Step 6: Final answer
    x = 618.99

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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.