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Finding the Fourth Proportional to 207,988.72, 312,009.04 and 67,709.68

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Solution

The fourth proportional to 207,988.72, 312,009.04 and 67,709.68 is: 101,572.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,988.72 : 312,009.04 = 67,709.68 : x
  2. Step 2: Convert to fraction form
    207,988.72/312,009.04 = 67,709.68/x
  3. Step 3: Cross multiply
    207,988.72x = 312,009.04 × 67,709.68
  4. Step 4: Simplify right side
    207,988.72x = 21,126,032,255.51
  5. Step 5: Solve for x
    x = 21,126,032,255.51/207,988.72
  6. Step 6: Final answer
    x = 101,572.97

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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.