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Finding the Fourth Proportional to 79,720.48, 110,056.48 and 61,775.20

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Solution

The fourth proportional to 79,720.48, 110,056.48 and 61,775.20 is: 85,282.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,720.48 : 110,056.48 = 61,775.20 : x
  2. Step 2: Convert to fraction form
    79,720.48/110,056.48 = 61,775.20/x
  3. Step 3: Cross multiply
    79,720.48x = 110,056.48 × 61,775.20
  4. Step 4: Simplify right side
    79,720.48x = 6,798,761,063.30
  5. Step 5: Solve for x
    x = 6,798,761,063.30/79,720.48
  6. Step 6: Final answer
    x = 85,282.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.