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Finding the Fourth Proportional to 71,720.07, 98,972.28 and 39,888.29

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Solution

The fourth proportional to 71,720.07, 98,972.28 and 39,888.29 is: 55,045.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,720.07 : 98,972.28 = 39,888.29 : x
  2. Step 2: Convert to fraction form
    71,720.07/98,972.28 = 39,888.29/x
  3. Step 3: Cross multiply
    71,720.07x = 98,972.28 × 39,888.29
  4. Step 4: Simplify right side
    71,720.07x = 3,947,834,511.74
  5. Step 5: Solve for x
    x = 3,947,834,511.74/71,720.07
  6. Step 6: Final answer
    x = 55,045.05

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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.