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Finding the Fourth Proportional to 31,978.51, 47,967.72 and 8,604.95

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Solution

The fourth proportional to 31,978.51, 47,967.72 and 8,604.95 is: 12,907.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,978.51 : 47,967.72 = 8,604.95 : x
  2. Step 2: Convert to fraction form
    31,978.51/47,967.72 = 8,604.95/x
  3. Step 3: Cross multiply
    31,978.51x = 47,967.72 × 8,604.95
  4. Step 4: Simplify right side
    31,978.51x = 412,759,592.38
  5. Step 5: Solve for x
    x = 412,759,592.38/31,978.51
  6. Step 6: Final answer
    x = 12,907.41

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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.