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Finding the Fourth Proportional to 100,985.67, 139,353.88 and 55,661.16

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Solution

The fourth proportional to 100,985.67, 139,353.88 and 55,661.16 is: 76,808.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,985.67 : 139,353.88 = 55,661.16 : x
  2. Step 2: Convert to fraction form
    100,985.67/139,353.88 = 55,661.16/x
  3. Step 3: Cross multiply
    100,985.67x = 139,353.88 × 55,661.16
  4. Step 4: Simplify right side
    100,985.67x = 7,756,598,611.30
  5. Step 5: Solve for x
    x = 7,756,598,611.30/100,985.67
  6. Step 6: Final answer
    x = 76,808.90

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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.