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Finding the Fourth Proportional to 440.55, 661.01 and 209.60

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Solution

The fourth proportional to 440.55, 661.01 and 209.60 is: 314.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.55 : 661.01 = 209.60 : x
  2. Step 2: Convert to fraction form
    440.55/661.01 = 209.60/x
  3. Step 3: Cross multiply
    440.55x = 661.01 × 209.60
  4. Step 4: Simplify right side
    440.55x = 138,547.70
  5. Step 5: Solve for x
    x = 138,547.70/440.55
  6. Step 6: Final answer
    x = 314.49

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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.