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Finding the Fourth Proportional to 3,990.42, 5,985.90 and 1,068.84

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Solution

The fourth proportional to 3,990.42, 5,985.90 and 1,068.84 is: 1,603.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.42 : 5,985.90 = 1,068.84 : x
  2. Step 2: Convert to fraction form
    3,990.42/5,985.90 = 1,068.84/x
  3. Step 3: Cross multiply
    3,990.42x = 5,985.90 × 1,068.84
  4. Step 4: Simplify right side
    3,990.42x = 6,397,969.36
  5. Step 5: Solve for x
    x = 6,397,969.36/3,990.42
  6. Step 6: Final answer
    x = 1,603.33

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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.