Home / 15,420.56-21,280.39-8,346.99

Finding the Fourth Proportional to 15,420.56, 21,280.39 and 8,346.99

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Solution

The fourth proportional to 15,420.56, 21,280.39 and 8,346.99 is: 11,518.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,420.56 : 21,280.39 = 8,346.99 : x
  2. Step 2: Convert to fraction form
    15,420.56/21,280.39 = 8,346.99/x
  3. Step 3: Cross multiply
    15,420.56x = 21,280.39 × 8,346.99
  4. Step 4: Simplify right side
    15,420.56x = 177,627,181.66
  5. Step 5: Solve for x
    x = 177,627,181.66/15,420.56
  6. Step 6: Final answer
    x = 11,518.85

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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.