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Finding the Fourth Proportional to 71,717.51, 98,968.75 and 39,885.72

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Solution

The fourth proportional to 71,717.51, 98,968.75 and 39,885.72 is: 55,041.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,717.51 : 98,968.75 = 39,885.72 : x
  2. Step 2: Convert to fraction form
    71,717.51/98,968.75 = 39,885.72/x
  3. Step 3: Cross multiply
    71,717.51x = 98,968.75 × 39,885.72
  4. Step 4: Simplify right side
    71,717.51x = 3,947,439,851.25
  5. Step 5: Solve for x
    x = 3,947,439,851.25/71,717.51
  6. Step 6: Final answer
    x = 55,041.51

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1.5x scale

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.