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Finding the Fourth Proportional to 65,220.36, 89,329.73 and 61,390.38

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Solution

The fourth proportional to 65,220.36, 89,329.73 and 61,390.38 is: 84,083.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,220.36 : 89,329.73 = 61,390.38 : x
  2. Step 2: Convert to fraction form
    65,220.36/89,329.73 = 61,390.38/x
  3. Step 3: Cross multiply
    65,220.36x = 89,329.73 × 61,390.38
  4. Step 4: Simplify right side
    65,220.36x = 5,483,985,316.40
  5. Step 5: Solve for x
    x = 5,483,985,316.40/65,220.36
  6. Step 6: Final answer
    x = 84,083.95

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.