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Finding the Fourth Proportional to 3,988.89, 5,986.07 and 1,391.82

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Solution

The fourth proportional to 3,988.89, 5,986.07 and 1,391.82 is: 2,088.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,988.89 : 5,986.07 = 1,391.82 : x
  2. Step 2: Convert to fraction form
    3,988.89/5,986.07 = 1,391.82/x
  3. Step 3: Cross multiply
    3,988.89x = 5,986.07 × 1,391.82
  4. Step 4: Simplify right side
    3,988.89x = 8,331,547.44
  5. Step 5: Solve for x
    x = 8,331,547.44/3,988.89
  6. Step 6: Final answer
    x = 2,088.69

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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.