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Finding the Fourth Proportional to 70,202.55, 105,139.80 and 68,793.15

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Solution

The fourth proportional to 70,202.55, 105,139.80 and 68,793.15 is: 103,028.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,202.55 : 105,139.80 = 68,793.15 : x
  2. Step 2: Convert to fraction form
    70,202.55/105,139.80 = 68,793.15/x
  3. Step 3: Cross multiply
    70,202.55x = 105,139.80 × 68,793.15
  4. Step 4: Simplify right side
    70,202.55x = 7,232,898,032.37
  5. Step 5: Solve for x
    x = 7,232,898,032.37/70,202.55
  6. Step 6: Final answer
    x = 103,028.99

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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.