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Finding the Fourth Proportional to 1,287.82, 1,779.51 and 1,027.90

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Solution

The fourth proportional to 1,287.82, 1,779.51 and 1,027.90 is: 1,420.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.82 : 1,779.51 = 1,027.90 : x
  2. Step 2: Convert to fraction form
    1,287.82/1,779.51 = 1,027.90/x
  3. Step 3: Cross multiply
    1,287.82x = 1,779.51 × 1,027.90
  4. Step 4: Simplify right side
    1,287.82x = 1,829,158.33
  5. Step 5: Solve for x
    x = 1,829,158.33/1,287.82
  6. Step 6: Final answer
    x = 1,420.35

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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.