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Finding the Fourth Proportional to 72,619.47, 100,214.62 and 40,353.95

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Solution

The fourth proportional to 72,619.47, 100,214.62 and 40,353.95 is: 55,688.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,619.47 : 100,214.62 = 40,353.95 : x
  2. Step 2: Convert to fraction form
    72,619.47/100,214.62 = 40,353.95/x
  3. Step 3: Cross multiply
    72,619.47x = 100,214.62 × 40,353.95
  4. Step 4: Simplify right side
    72,619.47x = 4,044,055,914.40
  5. Step 5: Solve for x
    x = 4,044,055,914.40/72,619.47
  6. Step 6: Final answer
    x = 55,688.31

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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.