Home / 15,355.20-21,188.60-8,639.76

Finding the Fourth Proportional to 15,355.20, 21,188.60 and 8,639.76

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Solution

The fourth proportional to 15,355.20, 21,188.60 and 8,639.76 is: 11,921.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,355.20 : 21,188.60 = 8,639.76 : x
  2. Step 2: Convert to fraction form
    15,355.20/21,188.60 = 8,639.76/x
  3. Step 3: Cross multiply
    15,355.20x = 21,188.60 × 8,639.76
  4. Step 4: Simplify right side
    15,355.20x = 183,064,418.74
  5. Step 5: Solve for x
    x = 183,064,418.74/15,355.20
  6. Step 6: Final answer
    x = 11,921.98

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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.