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Finding the Fourth Proportional to 78,384.78, 117,576.63 and 31,636.98

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Solution

The fourth proportional to 78,384.78, 117,576.63 and 31,636.98 is: 47,455.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,384.78 : 117,576.63 = 31,636.98 : x
  2. Step 2: Convert to fraction form
    78,384.78/117,576.63 = 31,636.98/x
  3. Step 3: Cross multiply
    78,384.78x = 117,576.63 × 31,636.98
  4. Step 4: Simplify right side
    78,384.78x = 3,719,769,491.78
  5. Step 5: Solve for x
    x = 3,719,769,491.78/78,384.78
  6. Step 6: Final answer
    x = 47,455.25

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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.