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Finding the Fourth Proportional to 45,487.80, 68,231.70 and 42,207.30

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Solution

The fourth proportional to 45,487.80, 68,231.70 and 42,207.30 is: 63,310.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,487.80 : 68,231.70 = 42,207.30 : x
  2. Step 2: Convert to fraction form
    45,487.80/68,231.70 = 42,207.30/x
  3. Step 3: Cross multiply
    45,487.80x = 68,231.70 × 42,207.30
  4. Step 4: Simplify right side
    45,487.80x = 2,879,875,831.41
  5. Step 5: Solve for x
    x = 2,879,875,831.41/45,487.80
  6. Step 6: Final answer
    x = 63,310.95

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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.