Home / 15,405.31-21,260.31-8,688.48

Finding the Fourth Proportional to 15,405.31, 21,260.31 and 8,688.48

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Solution

The fourth proportional to 15,405.31, 21,260.31 and 8,688.48 is: 11,990.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,405.31 : 21,260.31 = 8,688.48 : x
  2. Step 2: Convert to fraction form
    15,405.31/21,260.31 = 8,688.48/x
  3. Step 3: Cross multiply
    15,405.31x = 21,260.31 × 8,688.48
  4. Step 4: Simplify right side
    15,405.31x = 184,719,734.79
  5. Step 5: Solve for x
    x = 184,719,734.79/15,405.31
  6. Step 6: Final answer
    x = 11,990.66

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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.