Home / 2,987.61-4,123.00-1,643.28

Finding the Fourth Proportional to 2,987.61, 4,123.00 and 1,643.28

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Solution

The fourth proportional to 2,987.61, 4,123.00 and 1,643.28 is: 2,267.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.61 : 4,123.00 = 1,643.28 : x
  2. Step 2: Convert to fraction form
    2,987.61/4,123.00 = 1,643.28/x
  3. Step 3: Cross multiply
    2,987.61x = 4,123.00 × 1,643.28
  4. Step 4: Simplify right side
    2,987.61x = 6,775,233.31
  5. Step 5: Solve for x
    x = 6,775,233.31/2,987.61
  6. Step 6: Final answer
    x = 2,267.78

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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.