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Finding the Fourth Proportional to 138,405.88, 191,000.12 and 74,743.67

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Solution

The fourth proportional to 138,405.88, 191,000.12 and 74,743.67 is: 103,146.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,405.88 : 191,000.12 = 74,743.67 : x
  2. Step 2: Convert to fraction form
    138,405.88/191,000.12 = 74,743.67/x
  3. Step 3: Cross multiply
    138,405.88x = 191,000.12 × 74,743.67
  4. Step 4: Simplify right side
    138,405.88x = 14,276,050,043.02
  5. Step 5: Solve for x
    x = 14,276,050,043.02/138,405.88
  6. Step 6: Final answer
    x = 103,146.27

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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.