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Finding the Fourth Proportional to 210,570.39, 315,888.39 and 126,310.76

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Solution

The fourth proportional to 210,570.39, 315,888.39 and 126,310.76 is: 189,485.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,570.39 : 315,888.39 = 126,310.76 : x
  2. Step 2: Convert to fraction form
    210,570.39/315,888.39 = 126,310.76/x
  3. Step 3: Cross multiply
    210,570.39x = 315,888.39 × 126,310.76
  4. Step 4: Simplify right side
    210,570.39x = 39,900,101,036.63
  5. Step 5: Solve for x
    x = 39,900,101,036.63/210,570.39
  6. Step 6: Final answer
    x = 189,485.81

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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.