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Finding the Fourth Proportional to 3,990.63, 5,985.94 and 1,254.63

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Solution

The fourth proportional to 3,990.63, 5,985.94 and 1,254.63 is: 1,881.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.63 : 5,985.94 = 1,254.63 : x
  2. Step 2: Convert to fraction form
    3,990.63/5,985.94 = 1,254.63/x
  3. Step 3: Cross multiply
    3,990.63x = 5,985.94 × 1,254.63
  4. Step 4: Simplify right side
    3,990.63x = 7,510,109.97
  5. Step 5: Solve for x
    x = 7,510,109.97/3,990.63
  6. Step 6: Final answer
    x = 1,881.94

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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.