Home / 15,403.28-21,255.70-8,688.92

Finding the Fourth Proportional to 15,403.28, 21,255.70 and 8,688.92

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Solution

The fourth proportional to 15,403.28, 21,255.70 and 8,688.92 is: 11,990.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,403.28 : 21,255.70 = 8,688.92 : x
  2. Step 2: Convert to fraction form
    15,403.28/21,255.70 = 8,688.92/x
  3. Step 3: Cross multiply
    15,403.28x = 21,255.70 × 8,688.92
  4. Step 4: Simplify right side
    15,403.28x = 184,689,076.84
  5. Step 5: Solve for x
    x = 184,689,076.84/15,403.28
  6. Step 6: Final answer
    x = 11,990.24

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Double scale
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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.