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Finding the Fourth Proportional to 111,422.50, 153,763.08 and 61,121.50

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Solution

The fourth proportional to 111,422.50, 153,763.08 and 61,121.50 is: 84,347.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,422.50 : 153,763.08 = 61,121.50 : x
  2. Step 2: Convert to fraction form
    111,422.50/153,763.08 = 61,121.50/x
  3. Step 3: Cross multiply
    111,422.50x = 153,763.08 × 61,121.50
  4. Step 4: Simplify right side
    111,422.50x = 9,398,230,094.22
  5. Step 5: Solve for x
    x = 9,398,230,094.22/111,422.50
  6. Step 6: Final answer
    x = 84,347.69

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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.