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Finding the Fourth Proportional to 71,665.67, 98,899.79 and 39,401.63

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Solution

The fourth proportional to 71,665.67, 98,899.79 and 39,401.63 is: 54,374.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,665.67 : 98,899.79 = 39,401.63 : x
  2. Step 2: Convert to fraction form
    71,665.67/98,899.79 = 39,401.63/x
  3. Step 3: Cross multiply
    71,665.67x = 98,899.79 × 39,401.63
  4. Step 4: Simplify right side
    71,665.67x = 3,896,813,278.41
  5. Step 5: Solve for x
    x = 3,896,813,278.41/71,665.67
  6. Step 6: Final answer
    x = 54,374.90

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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.