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Finding the Fourth Proportional to 72,745.48, 100,569.18 and 72,081.28

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Solution

The fourth proportional to 72,745.48, 100,569.18 and 72,081.28 is: 99,650.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,745.48 : 100,569.18 = 72,081.28 : x
  2. Step 2: Convert to fraction form
    72,745.48/100,569.18 = 72,081.28/x
  3. Step 3: Cross multiply
    72,745.48x = 100,569.18 × 72,081.28
  4. Step 4: Simplify right side
    72,745.48x = 7,249,155,222.95
  5. Step 5: Solve for x
    x = 7,249,155,222.95/72,745.48
  6. Step 6: Final answer
    x = 99,650.94

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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.