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Finding the Fourth Proportional to 688.80, 950.55 and 409.02

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Solution

The fourth proportional to 688.80, 950.55 and 409.02 is: 564.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.80 : 950.55 = 409.02 : x
  2. Step 2: Convert to fraction form
    688.80/950.55 = 409.02/x
  3. Step 3: Cross multiply
    688.80x = 950.55 × 409.02
  4. Step 4: Simplify right side
    688.80x = 388,793.96
  5. Step 5: Solve for x
    x = 388,793.96/688.80
  6. Step 6: Final answer
    x = 564.45

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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.