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Finding the Fourth Proportional to 125,998.20, 189,288.90 and 86,632.20

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Solution

The fourth proportional to 125,998.20, 189,288.90 and 86,632.20 is: 130,148.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,998.20 : 189,288.90 = 86,632.20 : x
  2. Step 2: Convert to fraction form
    125,998.20/189,288.90 = 86,632.20/x
  3. Step 3: Cross multiply
    125,998.20x = 189,288.90 × 86,632.20
  4. Step 4: Simplify right side
    125,998.20x = 16,398,513,842.58
  5. Step 5: Solve for x
    x = 16,398,513,842.58/125,998.20
  6. Step 6: Final answer
    x = 130,148.79

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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.