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Finding the Fourth Proportional to 139,637.94, 207,877.66 and 138,807.69

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Solution

The fourth proportional to 139,637.94, 207,877.66 and 138,807.69 is: 206,641.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,637.94 : 207,877.66 = 138,807.69 : x
  2. Step 2: Convert to fraction form
    139,637.94/207,877.66 = 138,807.69/x
  3. Step 3: Cross multiply
    139,637.94x = 207,877.66 × 138,807.69
  4. Step 4: Simplify right side
    139,637.94x = 28,855,017,787.21
  5. Step 5: Solve for x
    x = 28,855,017,787.21/139,637.94
  6. Step 6: Final answer
    x = 206,641.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.