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Finding the Fourth Proportional to 210,605.40, 315,908.10 and 126,624.60

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Solution

The fourth proportional to 210,605.40, 315,908.10 and 126,624.60 is: 189,936.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,605.40 : 315,908.10 = 126,624.60 : x
  2. Step 2: Convert to fraction form
    210,605.40/315,908.10 = 126,624.60/x
  3. Step 3: Cross multiply
    210,605.40x = 315,908.10 × 126,624.60
  4. Step 4: Simplify right side
    210,605.40x = 40,001,736,799.26
  5. Step 5: Solve for x
    x = 40,001,736,799.26/210,605.40
  6. Step 6: Final answer
    x = 189,936.90

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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.