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Finding the Fourth Proportional to 111,988.38, 154,543.96 and 61,687.38

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Solution

The fourth proportional to 111,988.38, 154,543.96 and 61,687.38 is: 85,128.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,988.38 : 154,543.96 = 61,687.38 : x
  2. Step 2: Convert to fraction form
    111,988.38/154,543.96 = 61,687.38/x
  3. Step 3: Cross multiply
    111,988.38x = 154,543.96 × 61,687.38
  4. Step 4: Simplify right side
    111,988.38x = 9,533,411,987.22
  5. Step 5: Solve for x
    x = 9,533,411,987.22/111,988.38
  6. Step 6: Final answer
    x = 85,128.58

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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.