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Finding the Fourth Proportional to 138,412.70, 207,619.06 and 79,206.50

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Solution

The fourth proportional to 138,412.70, 207,619.06 and 79,206.50 is: 118,809.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,412.70 : 207,619.06 = 79,206.50 : x
  2. Step 2: Convert to fraction form
    138,412.70/207,619.06 = 79,206.50/x
  3. Step 3: Cross multiply
    138,412.70x = 207,619.06 × 79,206.50
  4. Step 4: Simplify right side
    138,412.70x = 16,444,778,679.86
  5. Step 5: Solve for x
    x = 16,444,778,679.86/138,412.70
  6. Step 6: Final answer
    x = 118,809.76

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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.