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Finding the Fourth Proportional to 138,323.70, 207,485.55 and 85,835.70

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Solution

The fourth proportional to 138,323.70, 207,485.55 and 85,835.70 is: 128,753.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,323.70 : 207,485.55 = 85,835.70 : x
  2. Step 2: Convert to fraction form
    138,323.70/207,485.55 = 85,835.70/x
  3. Step 3: Cross multiply
    138,323.70x = 207,485.55 × 85,835.70
  4. Step 4: Simplify right side
    138,323.70x = 17,809,667,424.14
  5. Step 5: Solve for x
    x = 17,809,667,424.14/138,323.70
  6. Step 6: Final answer
    x = 128,753.55

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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.