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Finding the Fourth Proportional to 8,699.78, 13,051.30 and 2,856.72

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Solution

The fourth proportional to 8,699.78, 13,051.30 and 2,856.72 is: 4,285.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,699.78 : 13,051.30 = 2,856.72 : x
  2. Step 2: Convert to fraction form
    8,699.78/13,051.30 = 2,856.72/x
  3. Step 3: Cross multiply
    8,699.78x = 13,051.30 × 2,856.72
  4. Step 4: Simplify right side
    8,699.78x = 37,283,909.74
  5. Step 5: Solve for x
    x = 37,283,909.74/8,699.78
  6. Step 6: Final answer
    x = 4,285.62

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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.