Home / 3,990.50-5,985.75-1,254.50

Finding the Fourth Proportional to 3,990.50, 5,985.75 and 1,254.50

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Solution

The fourth proportional to 3,990.50, 5,985.75 and 1,254.50 is: 1,881.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.50 : 5,985.75 = 1,254.50 : x
  2. Step 2: Convert to fraction form
    3,990.50/5,985.75 = 1,254.50/x
  3. Step 3: Cross multiply
    3,990.50x = 5,985.75 × 1,254.50
  4. Step 4: Simplify right side
    3,990.50x = 7,509,123.38
  5. Step 5: Solve for x
    x = 7,509,123.38/3,990.50
  6. Step 6: Final answer
    x = 1,881.75

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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.