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Finding the Fourth Proportional to 81,376.40, 121,805.40 and 58,048.40

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Solution

The fourth proportional to 81,376.40, 121,805.40 and 58,048.40 is: 86,887.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,376.40 : 121,805.40 = 58,048.40 : x
  2. Step 2: Convert to fraction form
    81,376.40/121,805.40 = 58,048.40/x
  3. Step 3: Cross multiply
    81,376.40x = 121,805.40 × 58,048.40
  4. Step 4: Simplify right side
    81,376.40x = 7,070,608,581.36
  5. Step 5: Solve for x
    x = 7,070,608,581.36/81,376.40
  6. Step 6: Final answer
    x = 86,887.70

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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.