Home / 20,931.25-28,885.14-11,500.42

Finding the Fourth Proportional to 20,931.25, 28,885.14 and 11,500.42

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Solution

The fourth proportional to 20,931.25, 28,885.14 and 11,500.42 is: 15,870.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.25 : 28,885.14 = 11,500.42 : x
  2. Step 2: Convert to fraction form
    20,931.25/28,885.14 = 11,500.42/x
  3. Step 3: Cross multiply
    20,931.25x = 28,885.14 × 11,500.42
  4. Step 4: Simplify right side
    20,931.25x = 332,191,241.76
  5. Step 5: Solve for x
    x = 332,191,241.76/20,931.25
  6. Step 6: Final answer
    x = 15,870.59

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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.