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Finding the Fourth Proportional to 70,065.12, 105,139.20 and 65,632.09

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Solution

The fourth proportional to 70,065.12, 105,139.20 and 65,632.09 is: 98,487.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,065.12 : 105,139.20 = 65,632.09 : x
  2. Step 2: Convert to fraction form
    70,065.12/105,139.20 = 65,632.09/x
  3. Step 3: Cross multiply
    70,065.12x = 105,139.20 × 65,632.09
  4. Step 4: Simplify right side
    70,065.12x = 6,900,505,436.93
  5. Step 5: Solve for x
    x = 6,900,505,436.93/70,065.12
  6. Step 6: Final answer
    x = 98,487.03

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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.