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Finding the Fourth Proportional to 67,220.63, 100,823.95 and 42,186.47

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Solution

The fourth proportional to 67,220.63, 100,823.95 and 42,186.47 is: 63,275.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,220.63 : 100,823.95 = 42,186.47 : x
  2. Step 2: Convert to fraction form
    67,220.63/100,823.95 = 42,186.47/x
  3. Step 3: Cross multiply
    67,220.63x = 100,823.95 × 42,186.47
  4. Step 4: Simplify right side
    67,220.63x = 4,253,405,932.37
  5. Step 5: Solve for x
    x = 4,253,405,932.37/67,220.63
  6. Step 6: Final answer
    x = 63,275.31

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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.