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Finding the Fourth Proportional to 426.43, 639.75 and 152.50

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Solution

The fourth proportional to 426.43, 639.75 and 152.50 is: 228.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.43 : 639.75 = 152.50 : x
  2. Step 2: Convert to fraction form
    426.43/639.75 = 152.50/x
  3. Step 3: Cross multiply
    426.43x = 639.75 × 152.50
  4. Step 4: Simplify right side
    426.43x = 97,561.88
  5. Step 5: Solve for x
    x = 97,561.88/426.43
  6. Step 6: Final answer
    x = 228.79

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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.