Home / 3,988.70-5,985.78-1,391.64

Finding the Fourth Proportional to 3,988.70, 5,985.78 and 1,391.64

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Solution

The fourth proportional to 3,988.70, 5,985.78 and 1,391.64 is: 2,088.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,988.70 : 5,985.78 = 1,391.64 : x
  2. Step 2: Convert to fraction form
    3,988.70/5,985.78 = 1,391.64/x
  3. Step 3: Cross multiply
    3,988.70x = 5,985.78 × 1,391.64
  4. Step 4: Simplify right side
    3,988.70x = 8,330,031.04
  5. Step 5: Solve for x
    x = 8,330,031.04/3,988.70
  6. Step 6: Final answer
    x = 2,088.41

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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.