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Finding the Fourth Proportional to 426.67, 639.62 and 152.70

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Solution

The fourth proportional to 426.67, 639.62 and 152.70 is: 228.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.67 : 639.62 = 152.70 : x
  2. Step 2: Convert to fraction form
    426.67/639.62 = 152.70/x
  3. Step 3: Cross multiply
    426.67x = 639.62 × 152.70
  4. Step 4: Simplify right side
    426.67x = 97,669.97
  5. Step 5: Solve for x
    x = 97,669.97/426.67
  6. Step 6: Final answer
    x = 228.91

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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.