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Finding the Fourth Proportional to 100,989.03, 139,362.93 and 55,049.07

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Solution

The fourth proportional to 100,989.03, 139,362.93 and 55,049.07 is: 75,966.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,989.03 : 139,362.93 = 55,049.07 : x
  2. Step 2: Convert to fraction form
    100,989.03/139,362.93 = 55,049.07/x
  3. Step 3: Cross multiply
    100,989.03x = 139,362.93 × 55,049.07
  4. Step 4: Simplify right side
    100,989.03x = 7,671,799,688.98
  5. Step 5: Solve for x
    x = 7,671,799,688.98/100,989.03
  6. Step 6: Final answer
    x = 75,966.66

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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.