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Finding the Fourth Proportional to 266.67, 399.93 and 189.40

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Solution

The fourth proportional to 266.67, 399.93 and 189.40 is: 284.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.67 : 399.93 = 189.40 : x
  2. Step 2: Convert to fraction form
    266.67/399.93 = 189.40/x
  3. Step 3: Cross multiply
    266.67x = 399.93 × 189.40
  4. Step 4: Simplify right side
    266.67x = 75,746.74
  5. Step 5: Solve for x
    x = 75,746.74/266.67
  6. Step 6: Final answer
    x = 284.05

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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.