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Finding the Fourth Proportional to 7,901.40, 11,819.70 and 7,123.80

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Solution

The fourth proportional to 7,901.40, 11,819.70 and 7,123.80 is: 10,656.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,901.40 : 11,819.70 = 7,123.80 : x
  2. Step 2: Convert to fraction form
    7,901.40/11,819.70 = 7,123.80/x
  3. Step 3: Cross multiply
    7,901.40x = 11,819.70 × 7,123.80
  4. Step 4: Simplify right side
    7,901.40x = 84,201,178.86
  5. Step 5: Solve for x
    x = 84,201,178.86/7,901.40
  6. Step 6: Final answer
    x = 10,656.49

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.