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Finding the Fourth Proportional to 111,988.30, 154,543.86 and 61,687.30

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Solution

The fourth proportional to 111,988.30, 154,543.86 and 61,687.30 is: 85,128.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,988.30 : 154,543.86 = 61,687.30 : x
  2. Step 2: Convert to fraction form
    111,988.30/154,543.86 = 61,687.30/x
  3. Step 3: Cross multiply
    111,988.30x = 154,543.86 × 61,687.30
  4. Step 4: Simplify right side
    111,988.30x = 9,533,393,454.98
  5. Step 5: Solve for x
    x = 9,533,393,454.98/111,988.30
  6. Step 6: Final answer
    x = 85,128.48

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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.