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Finding the Fourth Proportional to 2,987, 4,122.08 and 1,808.08

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Solution

The fourth proportional to 2,987, 4,122.08 and 1,808.08 is: 2,495.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987 : 4,122.08 = 1,808.08 : x
  2. Step 2: Convert to fraction form
    2,987/4,122.08 = 1,808.08/x
  3. Step 3: Cross multiply
    2,987x = 4,122.08 × 1,808.08
  4. Step 4: Simplify right side
    2,987x = 7,453,050.41
  5. Step 5: Solve for x
    x = 7,453,050.41/2,987
  6. Step 6: Final answer
    x = 2,495.16

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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.