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Finding the Fourth Proportional to 71,689.95, 98,931.62 and 39,858.57

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Solution

The fourth proportional to 71,689.95, 98,931.62 and 39,858.57 is: 55,004.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,689.95 : 98,931.62 = 39,858.57 : x
  2. Step 2: Convert to fraction form
    71,689.95/98,931.62 = 39,858.57/x
  3. Step 3: Cross multiply
    71,689.95x = 98,931.62 × 39,858.57
  4. Step 4: Simplify right side
    71,689.95x = 3,943,272,701.69
  5. Step 5: Solve for x
    x = 3,943,272,701.69/71,689.95
  6. Step 6: Final answer
    x = 55,004.54

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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.