Home / 20,931.89-28,885.79-11,500.25

Finding the Fourth Proportional to 20,931.89, 28,885.79 and 11,500.25

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Solution

The fourth proportional to 20,931.89, 28,885.79 and 11,500.25 is: 15,870.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.89 : 28,885.79 = 11,500.25 : x
  2. Step 2: Convert to fraction form
    20,931.89/28,885.79 = 11,500.25/x
  3. Step 3: Cross multiply
    20,931.89x = 28,885.79 × 11,500.25
  4. Step 4: Simplify right side
    20,931.89x = 332,193,690.77
  5. Step 5: Solve for x
    x = 332,193,690.77/20,931.89
  6. Step 6: Final answer
    x = 15,870.22

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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.