Home / 3,178.30-4,386.15-1,781.02

Finding the Fourth Proportional to 3,178.30, 4,386.15 and 1,781.02

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Solution

The fourth proportional to 3,178.30, 4,386.15 and 1,781.02 is: 2,457.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.30 : 4,386.15 = 1,781.02 : x
  2. Step 2: Convert to fraction form
    3,178.30/4,386.15 = 1,781.02/x
  3. Step 3: Cross multiply
    3,178.30x = 4,386.15 × 1,781.02
  4. Step 4: Simplify right side
    3,178.30x = 7,811,820.87
  5. Step 5: Solve for x
    x = 7,811,820.87/3,178.30
  6. Step 6: Final answer
    x = 2,457.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.