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Finding the Fourth Proportional to 71,890.79, 99,207.95 and 39,185.47

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Solution

The fourth proportional to 71,890.79, 99,207.95 and 39,185.47 is: 54,075.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,890.79 : 99,207.95 = 39,185.47 : x
  2. Step 2: Convert to fraction form
    71,890.79/99,207.95 = 39,185.47/x
  3. Step 3: Cross multiply
    71,890.79x = 99,207.95 × 39,185.47
  4. Step 4: Simplify right side
    71,890.79x = 3,887,510,076.57
  5. Step 5: Solve for x
    x = 3,887,510,076.57/71,890.79
  6. Step 6: Final answer
    x = 54,075.22

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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.