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Finding the Fourth Proportional to 139,487.92, 209,109.08 and 55,307.16

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Solution

The fourth proportional to 139,487.92, 209,109.08 and 55,307.16 is: 82,912.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,487.92 : 209,109.08 = 55,307.16 : x
  2. Step 2: Convert to fraction form
    139,487.92/209,109.08 = 55,307.16/x
  3. Step 3: Cross multiply
    139,487.92x = 209,109.08 × 55,307.16
  4. Step 4: Simplify right side
    139,487.92x = 11,565,229,483.28
  5. Step 5: Solve for x
    x = 11,565,229,483.28/139,487.92
  6. Step 6: Final answer
    x = 82,912.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.