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Finding the Fourth Proportional to 139,087.40, 191,926.50 and 85,374.68

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Solution

The fourth proportional to 139,087.40, 191,926.50 and 85,374.68 is: 117,808.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,087.40 : 191,926.50 = 85,374.68 : x
  2. Step 2: Convert to fraction form
    139,087.40/191,926.50 = 85,374.68/x
  3. Step 3: Cross multiply
    139,087.40x = 191,926.50 × 85,374.68
  4. Step 4: Simplify right side
    139,087.40x = 16,385,663,521.02
  5. Step 5: Solve for x
    x = 16,385,663,521.02/139,087.40
  6. Step 6: Final answer
    x = 117,808.40

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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.