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Finding the Fourth Proportional to 266.10, 399.15 and 168.90

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Solution

The fourth proportional to 266.10, 399.15 and 168.90 is: 253.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.10 : 399.15 = 168.90 : x
  2. Step 2: Convert to fraction form
    266.10/399.15 = 168.90/x
  3. Step 3: Cross multiply
    266.10x = 399.15 × 168.90
  4. Step 4: Simplify right side
    266.10x = 67,416.44
  5. Step 5: Solve for x
    x = 67,416.44/266.10
  6. Step 6: Final answer
    x = 253.35

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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.