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Finding the Fourth Proportional to 71,720.36, 98,972.67 and 39,888.57

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Solution

The fourth proportional to 71,720.36, 98,972.67 and 39,888.57 is: 55,045.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,720.36 : 98,972.67 = 39,888.57 : x
  2. Step 2: Convert to fraction form
    71,720.36/98,972.67 = 39,888.57/x
  3. Step 3: Cross multiply
    71,720.36x = 98,972.67 × 39,888.57
  4. Step 4: Simplify right side
    71,720.36x = 3,947,878,275.38
  5. Step 5: Solve for x
    x = 3,947,878,275.38/71,720.36
  6. Step 6: Final answer
    x = 55,045.44

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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.