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Finding the Fourth Proportional to 15,761.53, 21,751.06 and 8,688.21

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Solution

The fourth proportional to 15,761.53, 21,751.06 and 8,688.21 is: 11,989.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,761.53 : 21,751.06 = 8,688.21 : x
  2. Step 2: Convert to fraction form
    15,761.53/21,751.06 = 8,688.21/x
  3. Step 3: Cross multiply
    15,761.53x = 21,751.06 × 8,688.21
  4. Step 4: Simplify right side
    15,761.53x = 188,977,624.81
  5. Step 5: Solve for x
    x = 188,977,624.81/15,761.53
  6. Step 6: Final answer
    x = 11,989.80

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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.