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Finding the Fourth Proportional to 3,689.61, 5,091.64 and 2,117.69

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Solution

The fourth proportional to 3,689.61, 5,091.64 and 2,117.69 is: 2,922.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,689.61 : 5,091.64 = 2,117.69 : x
  2. Step 2: Convert to fraction form
    3,689.61/5,091.64 = 2,117.69/x
  3. Step 3: Cross multiply
    3,689.61x = 5,091.64 × 2,117.69
  4. Step 4: Simplify right side
    3,689.61x = 10,782,515.11
  5. Step 5: Solve for x
    x = 10,782,515.11/3,689.61
  6. Step 6: Final answer
    x = 2,922.40

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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.