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Finding the Fourth Proportional to 74,962.20, 112,443.30 and 70,879.80

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Solution

The fourth proportional to 74,962.20, 112,443.30 and 70,879.80 is: 106,319.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,962.20 : 112,443.30 = 70,879.80 : x
  2. Step 2: Convert to fraction form
    74,962.20/112,443.30 = 70,879.80/x
  3. Step 3: Cross multiply
    74,962.20x = 112,443.30 × 70,879.80
  4. Step 4: Simplify right side
    74,962.20x = 7,969,958,615.34
  5. Step 5: Solve for x
    x = 7,969,958,615.34/74,962.20
  6. Step 6: Final answer
    x = 106,319.70

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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.