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Finding the Fourth Proportional to 426.68, 639.74 and 152.78

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Solution

The fourth proportional to 426.68, 639.74 and 152.78 is: 229.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.68 : 639.74 = 152.78 : x
  2. Step 2: Convert to fraction form
    426.68/639.74 = 152.78/x
  3. Step 3: Cross multiply
    426.68x = 639.74 × 152.78
  4. Step 4: Simplify right side
    426.68x = 97,739.48
  5. Step 5: Solve for x
    x = 97,739.48/426.68
  6. Step 6: Final answer
    x = 229.07

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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.