Home / 20,931.36-28,885.94-11,500.12

Finding the Fourth Proportional to 20,931.36, 28,885.94 and 11,500.12

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Solution

The fourth proportional to 20,931.36, 28,885.94 and 11,500.12 is: 15,870.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.36 : 28,885.94 = 11,500.12 : x
  2. Step 2: Convert to fraction form
    20,931.36/28,885.94 = 11,500.12/x
  3. Step 3: Cross multiply
    20,931.36x = 28,885.94 × 11,500.12
  4. Step 4: Simplify right side
    20,931.36x = 332,191,776.31
  5. Step 5: Solve for x
    x = 332,191,776.31/20,931.36
  6. Step 6: Final answer
    x = 15,870.53

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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.