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Finding the Fourth Proportional to 139,477.95, 209,205.03 and 55,215.21

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Solution

The fourth proportional to 139,477.95, 209,205.03 and 55,215.21 is: 82,818.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,477.95 : 209,205.03 = 55,215.21 : x
  2. Step 2: Convert to fraction form
    139,477.95/209,205.03 = 55,215.21/x
  3. Step 3: Cross multiply
    139,477.95x = 209,205.03 × 55,215.21
  4. Step 4: Simplify right side
    139,477.95x = 11,551,299,664.51
  5. Step 5: Solve for x
    x = 11,551,299,664.51/139,477.95
  6. Step 6: Final answer
    x = 82,818.11

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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.