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Finding the Fourth Proportional to 68,750.20, 103,076.70 and 31,328.20

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Solution

The fourth proportional to 68,750.20, 103,076.70 and 31,328.20 is: 46,970.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,750.20 : 103,076.70 = 31,328.20 : x
  2. Step 2: Convert to fraction form
    68,750.20/103,076.70 = 31,328.20/x
  3. Step 3: Cross multiply
    68,750.20x = 103,076.70 × 31,328.20
  4. Step 4: Simplify right side
    68,750.20x = 3,229,207,472.94
  5. Step 5: Solve for x
    x = 3,229,207,472.94/68,750.20
  6. Step 6: Final answer
    x = 46,970.15

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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.