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Finding the Fourth Proportional to 661.55, 912.09 and 543.09

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Solution

The fourth proportional to 661.55, 912.09 and 543.09 is: 748.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.55 : 912.09 = 543.09 : x
  2. Step 2: Convert to fraction form
    661.55/912.09 = 543.09/x
  3. Step 3: Cross multiply
    661.55x = 912.09 × 543.09
  4. Step 4: Simplify right side
    661.55x = 495,346.96
  5. Step 5: Solve for x
    x = 495,346.96/661.55
  6. Step 6: Final answer
    x = 748.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.