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Finding the Fourth Proportional to 112,978.80, 169,511.40 and 111,207.60

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Solution

The fourth proportional to 112,978.80, 169,511.40 and 111,207.60 is: 166,853.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,978.80 : 169,511.40 = 111,207.60 : x
  2. Step 2: Convert to fraction form
    112,978.80/169,511.40 = 111,207.60/x
  3. Step 3: Cross multiply
    112,978.80x = 169,511.40 × 111,207.60
  4. Step 4: Simplify right side
    112,978.80x = 18,850,955,966.64
  5. Step 5: Solve for x
    x = 18,850,955,966.64/112,978.80
  6. Step 6: Final answer
    x = 166,853.92

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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.