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Finding the Fourth Proportional to 8,689.78, 11,993.55 and 5,154.94

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Solution

The fourth proportional to 8,689.78, 11,993.55 and 5,154.94 is: 7,114.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.78 : 11,993.55 = 5,154.94 : x
  2. Step 2: Convert to fraction form
    8,689.78/11,993.55 = 5,154.94/x
  3. Step 3: Cross multiply
    8,689.78x = 11,993.55 × 5,154.94
  4. Step 4: Simplify right side
    8,689.78x = 61,825,970.67
  5. Step 5: Solve for x
    x = 61,825,970.67/8,689.78
  6. Step 6: Final answer
    x = 7,114.80

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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.