Home / 20,688.29-28,549.89-11,256.86

Finding the Fourth Proportional to 20,688.29, 28,549.89 and 11,256.86

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Solution

The fourth proportional to 20,688.29, 28,549.89 and 11,256.86 is: 15,534.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.29 : 28,549.89 = 11,256.86 : x
  2. Step 2: Convert to fraction form
    20,688.29/28,549.89 = 11,256.86/x
  3. Step 3: Cross multiply
    20,688.29x = 28,549.89 × 11,256.86
  4. Step 4: Simplify right side
    20,688.29x = 321,381,972.00
  5. Step 5: Solve for x
    x = 321,381,972.00/20,688.29
  6. Step 6: Final answer
    x = 15,534.49

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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.