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Finding the Fourth Proportional to 97,717.80, 146,139.30 and 81,971.40

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Solution

The fourth proportional to 97,717.80, 146,139.30 and 81,971.40 is: 122,590.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    97,717.80 : 146,139.30 = 81,971.40 : x
  2. Step 2: Convert to fraction form
    97,717.80/146,139.30 = 81,971.40/x
  3. Step 3: Cross multiply
    97,717.80x = 146,139.30 × 81,971.40
  4. Step 4: Simplify right side
    97,717.80x = 11,979,243,016.02
  5. Step 5: Solve for x
    x = 11,979,243,016.02/97,717.80
  6. Step 6: Final answer
    x = 122,590.18

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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.