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Finding the Fourth Proportional to 426.19, 639.40 and 152.31

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Solution

The fourth proportional to 426.19, 639.40 and 152.31 is: 228.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.19 : 639.40 = 152.31 : x
  2. Step 2: Convert to fraction form
    426.19/639.40 = 152.31/x
  3. Step 3: Cross multiply
    426.19x = 639.40 × 152.31
  4. Step 4: Simplify right side
    426.19x = 97,387.39
  5. Step 5: Solve for x
    x = 97,387.39/426.19
  6. Step 6: Final answer
    x = 228.51

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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.