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Finding the Fourth Proportional to 61,211.51, 84,390.68 and 39,953.87

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Solution

The fourth proportional to 61,211.51, 84,390.68 and 39,953.87 is: 55,083.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,211.51 : 84,390.68 = 39,953.87 : x
  2. Step 2: Convert to fraction form
    61,211.51/84,390.68 = 39,953.87/x
  3. Step 3: Cross multiply
    61,211.51x = 84,390.68 × 39,953.87
  4. Step 4: Simplify right side
    61,211.51x = 3,371,734,257.93
  5. Step 5: Solve for x
    x = 3,371,734,257.93/61,211.51
  6. Step 6: Final answer
    x = 55,083.34

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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.