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Finding the Fourth Proportional to 125,778.32, 188,667.47 and 86,215.49

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Solution

The fourth proportional to 125,778.32, 188,667.47 and 86,215.49 is: 129,323.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,778.32 : 188,667.47 = 86,215.49 : x
  2. Step 2: Convert to fraction form
    125,778.32/188,667.47 = 86,215.49/x
  3. Step 3: Cross multiply
    125,778.32x = 188,667.47 × 86,215.49
  4. Step 4: Simplify right side
    125,778.32x = 16,266,056,998.70
  5. Step 5: Solve for x
    x = 16,266,056,998.70/125,778.32
  6. Step 6: Final answer
    x = 129,323.22

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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.