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Finding the Fourth Proportional to 3,990.15, 5,985.24 and 1,392.48

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Solution

The fourth proportional to 3,990.15, 5,985.24 and 1,392.48 is: 2,088.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.15 : 5,985.24 = 1,392.48 : x
  2. Step 2: Convert to fraction form
    3,990.15/5,985.24 = 1,392.48/x
  3. Step 3: Cross multiply
    3,990.15x = 5,985.24 × 1,392.48
  4. Step 4: Simplify right side
    3,990.15x = 8,334,327.00
  5. Step 5: Solve for x
    x = 8,334,327.00/3,990.15
  6. Step 6: Final answer
    x = 2,088.73

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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.