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Finding the Fourth Proportional to 8,689.55, 11,991.65 and 5,155.11

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Solution

The fourth proportional to 8,689.55, 11,991.65 and 5,155.11 is: 7,114.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.55 : 11,991.65 = 5,155.11 : x
  2. Step 2: Convert to fraction form
    8,689.55/11,991.65 = 5,155.11/x
  3. Step 3: Cross multiply
    8,689.55x = 11,991.65 × 5,155.11
  4. Step 4: Simplify right side
    8,689.55x = 61,818,249.06
  5. Step 5: Solve for x
    x = 61,818,249.06/8,689.55
  6. Step 6: Final answer
    x = 7,114.10

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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.