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Finding the Fourth Proportional to 111,228.31, 166,768.64 and 77,988.64

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Solution

The fourth proportional to 111,228.31, 166,768.64 and 77,988.64 is: 116,931.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,228.31 : 166,768.64 = 77,988.64 : x
  2. Step 2: Convert to fraction form
    111,228.31/166,768.64 = 77,988.64/x
  3. Step 3: Cross multiply
    111,228.31x = 166,768.64 × 77,988.64
  4. Step 4: Simplify right side
    111,228.31x = 13,006,059,665.22
  5. Step 5: Solve for x
    x = 13,006,059,665.22/111,228.31
  6. Step 6: Final answer
    x = 116,931.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.