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Finding the Fourth Proportional to 8,688.90, 11,978.12 and 5,699.56

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Solution

The fourth proportional to 8,688.90, 11,978.12 and 5,699.56 is: 7,857.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,688.90 : 11,978.12 = 5,699.56 : x
  2. Step 2: Convert to fraction form
    8,688.90/11,978.12 = 5,699.56/x
  3. Step 3: Cross multiply
    8,688.90x = 11,978.12 × 5,699.56
  4. Step 4: Simplify right side
    8,688.90x = 68,270,013.63
  5. Step 5: Solve for x
    x = 68,270,013.63/8,688.90
  6. Step 6: Final answer
    x = 7,857.15

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1.5x scale

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.