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Finding the Fourth Proportional to 138,123.88, 207,185.80 and 91,365.82

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Solution

The fourth proportional to 138,123.88, 207,185.80 and 91,365.82 is: 137,048.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,123.88 : 207,185.80 = 91,365.82 : x
  2. Step 2: Convert to fraction form
    138,123.88/207,185.80 = 91,365.82/x
  3. Step 3: Cross multiply
    138,123.88x = 207,185.80 × 91,365.82
  4. Step 4: Simplify right side
    138,123.88x = 18,929,700,509.36
  5. Step 5: Solve for x
    x = 18,929,700,509.36/138,123.88
  6. Step 6: Final answer
    x = 137,048.72

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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.