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Finding the Fourth Proportional to 65,115.20, 97,678.20 and 20,740.70

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Solution

The fourth proportional to 65,115.20, 97,678.20 and 20,740.70 is: 31,112.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,115.20 : 97,678.20 = 20,740.70 : x
  2. Step 2: Convert to fraction form
    65,115.20/97,678.20 = 20,740.70/x
  3. Step 3: Cross multiply
    65,115.20x = 97,678.20 × 20,740.70
  4. Step 4: Simplify right side
    65,115.20x = 2,025,914,242.74
  5. Step 5: Solve for x
    x = 2,025,914,242.74/65,115.20
  6. Step 6: Final answer
    x = 31,112.77

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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.