Home / 15,761.40-21,750.82-8,688.30

Finding the Fourth Proportional to 15,761.40, 21,750.82 and 8,688.30

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Solution

The fourth proportional to 15,761.40, 21,750.82 and 8,688.30 is: 11,989.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,761.40 : 21,750.82 = 8,688.30 : x
  2. Step 2: Convert to fraction form
    15,761.40/21,750.82 = 8,688.30/x
  3. Step 3: Cross multiply
    15,761.40x = 21,750.82 × 8,688.30
  4. Step 4: Simplify right side
    15,761.40x = 188,977,649.41
  5. Step 5: Solve for x
    x = 188,977,649.41/15,761.40
  6. Step 6: Final answer
    x = 11,989.90

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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.