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Finding the Fourth Proportional to 81,979.24, 112,893.54 and 71,219.24

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Solution

The fourth proportional to 81,979.24, 112,893.54 and 71,219.24 is: 98,075.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,979.24 : 112,893.54 = 71,219.24 : x
  2. Step 2: Convert to fraction form
    81,979.24/112,893.54 = 71,219.24/x
  3. Step 3: Cross multiply
    81,979.24x = 112,893.54 × 71,219.24
  4. Step 4: Simplify right side
    81,979.24x = 8,040,192,119.71
  5. Step 5: Solve for x
    x = 8,040,192,119.71/81,979.24
  6. Step 6: Final answer
    x = 98,075.95

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1.5x scale

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.