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Finding the Fourth Proportional to 71,803.71, 99,089.09 and 39,980.13

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Solution

The fourth proportional to 71,803.71, 99,089.09 and 39,980.13 is: 55,172.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,803.71 : 99,089.09 = 39,980.13 : x
  2. Step 2: Convert to fraction form
    71,803.71/99,089.09 = 39,980.13/x
  3. Step 3: Cross multiply
    71,803.71x = 99,089.09 × 39,980.13
  4. Step 4: Simplify right side
    71,803.71x = 3,961,594,499.88
  5. Step 5: Solve for x
    x = 3,961,594,499.88/71,803.71
  6. Step 6: Final answer
    x = 55,172.56

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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.