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Finding the Fourth Proportional to 73,988.64, 102,137.28 and 56,986.72

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Solution

The fourth proportional to 73,988.64, 102,137.28 and 56,986.72 is: 78,667.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,988.64 : 102,137.28 = 56,986.72 : x
  2. Step 2: Convert to fraction form
    73,988.64/102,137.28 = 56,986.72/x
  3. Step 3: Cross multiply
    73,988.64x = 102,137.28 × 56,986.72
  4. Step 4: Simplify right side
    73,988.64x = 5,820,468,576.92
  5. Step 5: Solve for x
    x = 5,820,468,576.92/73,988.64
  6. Step 6: Final answer
    x = 78,667.06

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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.