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Finding the Fourth Proportional to 284.06, 426.08 and 78.66

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Solution

The fourth proportional to 284.06, 426.08 and 78.66 is: 117.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.06 : 426.08 = 78.66 : x
  2. Step 2: Convert to fraction form
    284.06/426.08 = 78.66/x
  3. Step 3: Cross multiply
    284.06x = 426.08 × 78.66
  4. Step 4: Simplify right side
    284.06x = 33,515.45
  5. Step 5: Solve for x
    x = 33,515.45/284.06
  6. Step 6: Final answer
    x = 117.99

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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.