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Finding the Fourth Proportional to 81,390.20, 121,866.60 and 81,390.20

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Solution

The fourth proportional to 81,390.20, 121,866.60 and 81,390.20 is: 121,866.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,390.20 : 121,866.60 = 81,390.20 : x
  2. Step 2: Convert to fraction form
    81,390.20/121,866.60 = 81,390.20/x
  3. Step 3: Cross multiply
    81,390.20x = 121,866.60 × 81,390.20
  4. Step 4: Simplify right side
    81,390.20x = 9,918,746,947.32
  5. Step 5: Solve for x
    x = 9,918,746,947.32/81,390.20
  6. Step 6: Final answer
    x = 121,866.60

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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.