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Finding the Fourth Proportional to 78,462.40, 117,693.60 and 45,169.60

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Solution

The fourth proportional to 78,462.40, 117,693.60 and 45,169.60 is: 67,754.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,462.40 : 117,693.60 = 45,169.60 : x
  2. Step 2: Convert to fraction form
    78,462.40/117,693.60 = 45,169.60/x
  3. Step 3: Cross multiply
    78,462.40x = 117,693.60 × 45,169.60
  4. Step 4: Simplify right side
    78,462.40x = 5,316,172,834.56
  5. Step 5: Solve for x
    x = 5,316,172,834.56/78,462.40
  6. Step 6: Final answer
    x = 67,754.40

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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.