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Finding the Fourth Proportional to 139,021.50, 191,848.59 and 75,357.66

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Solution

The fourth proportional to 139,021.50, 191,848.59 and 75,357.66 is: 103,992.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,021.50 : 191,848.59 = 75,357.66 : x
  2. Step 2: Convert to fraction form
    139,021.50/191,848.59 = 75,357.66/x
  3. Step 3: Cross multiply
    139,021.50x = 191,848.59 × 75,357.66
  4. Step 4: Simplify right side
    139,021.50x = 14,457,260,816.70
  5. Step 5: Solve for x
    x = 14,457,260,816.70/139,021.50
  6. Step 6: Final answer
    x = 103,992.99

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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.