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Finding the Fourth Proportional to 138,737.70, 208,106.55 and 103,308.30

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Solution

The fourth proportional to 138,737.70, 208,106.55 and 103,308.30 is: 154,962.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,737.70 : 208,106.55 = 103,308.30 : x
  2. Step 2: Convert to fraction form
    138,737.70/208,106.55 = 103,308.30/x
  3. Step 3: Cross multiply
    138,737.70x = 208,106.55 × 103,308.30
  4. Step 4: Simplify right side
    138,737.70x = 21,499,133,899.37
  5. Step 5: Solve for x
    x = 21,499,133,899.37/138,737.70
  6. Step 6: Final answer
    x = 154,962.45

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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.