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Finding the Fourth Proportional to 3,988.49, 5,980.91 and 1,390.82

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Solution

The fourth proportional to 3,988.49, 5,980.91 and 1,390.82 is: 2,085.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,988.49 : 5,980.91 = 1,390.82 : x
  2. Step 2: Convert to fraction form
    3,988.49/5,980.91 = 1,390.82/x
  3. Step 3: Cross multiply
    3,988.49x = 5,980.91 × 1,390.82
  4. Step 4: Simplify right side
    3,988.49x = 8,318,332.39
  5. Step 5: Solve for x
    x = 8,318,332.39/3,988.49
  6. Step 6: Final answer
    x = 2,085.59

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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.