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Finding the Fourth Proportional to 79,980.64, 110,291.60 and 48,143.20

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Solution

The fourth proportional to 79,980.64, 110,291.60 and 48,143.20 is: 66,388.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,980.64 : 110,291.60 = 48,143.20 : x
  2. Step 2: Convert to fraction form
    79,980.64/110,291.60 = 48,143.20/x
  3. Step 3: Cross multiply
    79,980.64x = 110,291.60 × 48,143.20
  4. Step 4: Simplify right side
    79,980.64x = 5,309,790,557.12
  5. Step 5: Solve for x
    x = 5,309,790,557.12/79,980.64
  6. Step 6: Final answer
    x = 66,388.45

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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.