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Finding the Fourth Proportional to 111,988.14, 154,543.64 and 61,687.14

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Solution

The fourth proportional to 111,988.14, 154,543.64 and 61,687.14 is: 85,128.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,988.14 : 154,543.64 = 61,687.14 : x
  2. Step 2: Convert to fraction form
    111,988.14/154,543.64 = 61,687.14/x
  3. Step 3: Cross multiply
    111,988.14x = 154,543.64 × 61,687.14
  4. Step 4: Simplify right side
    111,988.14x = 9,533,355,156.79
  5. Step 5: Solve for x
    x = 9,533,355,156.79/111,988.14
  6. Step 6: Final answer
    x = 85,128.26

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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.