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Finding the Fourth Proportional to 138,323.70, 207,485.55 and 103,331.70

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Solution

The fourth proportional to 138,323.70, 207,485.55 and 103,331.70 is: 154,997.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,323.70 : 207,485.55 = 103,331.70 : x
  2. Step 2: Convert to fraction form
    138,323.70/207,485.55 = 103,331.70/x
  3. Step 3: Cross multiply
    138,323.70x = 207,485.55 × 103,331.70
  4. Step 4: Simplify right side
    138,323.70x = 21,439,834,606.94
  5. Step 5: Solve for x
    x = 21,439,834,606.94/138,323.70
  6. Step 6: Final answer
    x = 154,997.55

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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.