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Finding the Fourth Proportional to 138,408.30, 207,612.45 and 120,912.30

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Solution

The fourth proportional to 138,408.30, 207,612.45 and 120,912.30 is: 181,368.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,408.30 : 207,612.45 = 120,912.30 : x
  2. Step 2: Convert to fraction form
    138,408.30/207,612.45 = 120,912.30/x
  3. Step 3: Cross multiply
    138,408.30x = 207,612.45 × 120,912.30
  4. Step 4: Simplify right side
    138,408.30x = 25,102,898,838.14
  5. Step 5: Solve for x
    x = 25,102,898,838.14/138,408.30
  6. Step 6: Final answer
    x = 181,368.45

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1.5x scale

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.