Home / 20,808.18-28,715.18-11,376.81

Finding the Fourth Proportional to 20,808.18, 28,715.18 and 11,376.81

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Solution

The fourth proportional to 20,808.18, 28,715.18 and 11,376.81 is: 15,699.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,808.18 : 28,715.18 = 11,376.81 : x
  2. Step 2: Convert to fraction form
    20,808.18/28,715.18 = 11,376.81/x
  3. Step 3: Cross multiply
    20,808.18x = 28,715.18 × 11,376.81
  4. Step 4: Simplify right side
    20,808.18x = 326,687,090.09
  5. Step 5: Solve for x
    x = 326,687,090.09/20,808.18
  6. Step 6: Final answer
    x = 15,699.94

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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.