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Finding the Fourth Proportional to 81,290.10, 121,935.15 and 81,290.10

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Solution

The fourth proportional to 81,290.10, 121,935.15 and 81,290.10 is: 121,935.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,290.10 : 121,935.15 = 81,290.10 : x
  2. Step 2: Convert to fraction form
    81,290.10/121,935.15 = 81,290.10/x
  3. Step 3: Cross multiply
    81,290.10x = 121,935.15 × 81,290.10
  4. Step 4: Simplify right side
    81,290.10x = 9,912,120,537.02
  5. Step 5: Solve for x
    x = 9,912,120,537.02/81,290.10
  6. Step 6: Final answer
    x = 121,935.15

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1.5x scale

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.