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Finding the Fourth Proportional to 72,320.78, 99,806.38 and 40,487.78

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Solution

The fourth proportional to 72,320.78, 99,806.38 and 40,487.78 is: 55,875.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,320.78 : 99,806.38 = 40,487.78 : x
  2. Step 2: Convert to fraction form
    72,320.78/99,806.38 = 40,487.78/x
  3. Step 3: Cross multiply
    72,320.78x = 99,806.38 × 40,487.78
  4. Step 4: Simplify right side
    72,320.78x = 4,040,938,756.04
  5. Step 5: Solve for x
    x = 4,040,938,756.04/72,320.78
  6. Step 6: Final answer
    x = 55,875.21

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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.