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Finding the Fourth Proportional to 475.15, 711.80 and 423.55

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Solution

The fourth proportional to 475.15, 711.80 and 423.55 is: 634.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.15 : 711.80 = 423.55 : x
  2. Step 2: Convert to fraction form
    475.15/711.80 = 423.55/x
  3. Step 3: Cross multiply
    475.15x = 711.80 × 423.55
  4. Step 4: Simplify right side
    475.15x = 301,480.77
  5. Step 5: Solve for x
    x = 301,480.77/475.15
  6. Step 6: Final answer
    x = 634.50

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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.