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Finding the Fourth Proportional to 111,161.80, 153,422.66 and 65,865.28

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Solution

The fourth proportional to 111,161.80, 153,422.66 and 65,865.28 is: 90,905.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,161.80 : 153,422.66 = 65,865.28 : x
  2. Step 2: Convert to fraction form
    111,161.80/153,422.66 = 65,865.28/x
  3. Step 3: Cross multiply
    111,161.80x = 153,422.66 × 65,865.28
  4. Step 4: Simplify right side
    111,161.80x = 10,105,226,459.24
  5. Step 5: Solve for x
    x = 10,105,226,459.24/111,161.80
  6. Step 6: Final answer
    x = 90,905.57

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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.