Home / 3,178.80-4,386.12-1,781.28

Finding the Fourth Proportional to 3,178.80, 4,386.12 and 1,781.28

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Solution

The fourth proportional to 3,178.80, 4,386.12 and 1,781.28 is: 2,457.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.80 : 4,386.12 = 1,781.28 : x
  2. Step 2: Convert to fraction form
    3,178.80/4,386.12 = 1,781.28/x
  3. Step 3: Cross multiply
    3,178.80x = 4,386.12 × 1,781.28
  4. Step 4: Simplify right side
    3,178.80x = 7,812,907.83
  5. Step 5: Solve for x
    x = 7,812,907.83/3,178.80
  6. Step 6: Final answer
    x = 2,457.82

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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.