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Finding the Fourth Proportional to 138,988.89, 191,805 and 75,326.67

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Solution

The fourth proportional to 138,988.89, 191,805 and 75,326.67 is: 103,950.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,988.89 : 191,805 = 75,326.67 : x
  2. Step 2: Convert to fraction form
    138,988.89/191,805 = 75,326.67/x
  3. Step 3: Cross multiply
    138,988.89x = 191,805 × 75,326.67
  4. Step 4: Simplify right side
    138,988.89x = 14,448,031,939.35
  5. Step 5: Solve for x
    x = 14,448,031,939.35/138,988.89
  6. Step 6: Final answer
    x = 103,950.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.