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Finding the Fourth Proportional to 121,220.40, 181,768.32 and 65,107.72

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Solution

The fourth proportional to 121,220.40, 181,768.32 and 65,107.72 is: 97,628.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,220.40 : 181,768.32 = 65,107.72 : x
  2. Step 2: Convert to fraction form
    121,220.40/181,768.32 = 65,107.72/x
  3. Step 3: Cross multiply
    121,220.40x = 181,768.32 × 65,107.72
  4. Step 4: Simplify right side
    121,220.40x = 11,834,520,883.43
  5. Step 5: Solve for x
    x = 11,834,520,883.43/121,220.40
  6. Step 6: Final answer
    x = 97,628.13

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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.