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Finding the Fourth Proportional to 103,900.71, 143,316.49 and 72,057.99

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Solution

The fourth proportional to 103,900.71, 143,316.49 and 72,057.99 is: 99,393.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,900.71 : 143,316.49 = 72,057.99 : x
  2. Step 2: Convert to fraction form
    103,900.71/143,316.49 = 72,057.99/x
  3. Step 3: Cross multiply
    103,900.71x = 143,316.49 × 72,057.99
  4. Step 4: Simplify right side
    103,900.71x = 10,327,098,203.26
  5. Step 5: Solve for x
    x = 10,327,098,203.26/103,900.71
  6. Step 6: Final answer
    x = 99,393.91

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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.