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Finding the Fourth Proportional to 5,390.31, 8,070.87 and 3,987

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Solution

The fourth proportional to 5,390.31, 8,070.87 and 3,987 is: 5,969.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,390.31 : 8,070.87 = 3,987 : x
  2. Step 2: Convert to fraction form
    5,390.31/8,070.87 = 3,987/x
  3. Step 3: Cross multiply
    5,390.31x = 8,070.87 × 3,987
  4. Step 4: Simplify right side
    5,390.31x = 32,178,558.69
  5. Step 5: Solve for x
    x = 32,178,558.69/5,390.31
  6. Step 6: Final answer
    x = 5,969.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.