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Finding the Fourth Proportional to 7,781.70, 11,672.58 and 1,938.30

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Solution

The fourth proportional to 7,781.70, 11,672.58 and 1,938.30 is: 2,907.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,781.70 : 11,672.58 = 1,938.30 : x
  2. Step 2: Convert to fraction form
    7,781.70/11,672.58 = 1,938.30/x
  3. Step 3: Cross multiply
    7,781.70x = 11,672.58 × 1,938.30
  4. Step 4: Simplify right side
    7,781.70x = 22,624,961.81
  5. Step 5: Solve for x
    x = 22,624,961.81/7,781.70
  6. Step 6: Final answer
    x = 2,907.46

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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.