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Finding the Fourth Proportional to 138,415.19, 207,622.81 and 79,209

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Solution

The fourth proportional to 138,415.19, 207,622.81 and 79,209 is: 118,813.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,415.19 : 207,622.81 = 79,209 : x
  2. Step 2: Convert to fraction form
    138,415.19/207,622.81 = 79,209/x
  3. Step 3: Cross multiply
    138,415.19x = 207,622.81 × 79,209
  4. Step 4: Simplify right side
    138,415.19x = 16,445,595,157.29
  5. Step 5: Solve for x
    x = 16,445,595,157.29/138,415.19
  6. Step 6: Final answer
    x = 118,813.51

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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.