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Finding the Fourth Proportional to 15,761.86, 21,750.96 and 8,688.16

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Solution

The fourth proportional to 15,761.86, 21,750.96 and 8,688.16 is: 11,989.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,761.86 : 21,750.96 = 8,688.16 : x
  2. Step 2: Convert to fraction form
    15,761.86/21,750.96 = 8,688.16/x
  3. Step 3: Cross multiply
    15,761.86x = 21,750.96 × 8,688.16
  4. Step 4: Simplify right side
    15,761.86x = 188,975,820.63
  5. Step 5: Solve for x
    x = 188,975,820.63/15,761.86
  6. Step 6: Final answer
    x = 11,989.44

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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.