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Finding the Fourth Proportional to 7,125.78, 10,689.27 and 1,861.49

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Solution

The fourth proportional to 7,125.78, 10,689.27 and 1,861.49 is: 2,792.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,125.78 : 10,689.27 = 1,861.49 : x
  2. Step 2: Convert to fraction form
    7,125.78/10,689.27 = 1,861.49/x
  3. Step 3: Cross multiply
    7,125.78x = 10,689.27 × 1,861.49
  4. Step 4: Simplify right side
    7,125.78x = 19,897,969.21
  5. Step 5: Solve for x
    x = 19,897,969.21/7,125.78
  6. Step 6: Final answer
    x = 2,792.39

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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.