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Finding the Fourth Proportional to 426.20, 639.43 and 152.10

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Solution

The fourth proportional to 426.20, 639.43 and 152.10 is: 228.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.20 : 639.43 = 152.10 : x
  2. Step 2: Convert to fraction form
    426.20/639.43 = 152.10/x
  3. Step 3: Cross multiply
    426.20x = 639.43 × 152.10
  4. Step 4: Simplify right side
    426.20x = 97,256.92
  5. Step 5: Solve for x
    x = 97,256.92/426.20
  6. Step 6: Final answer
    x = 228.20

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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.