Home / 20,931.06-28,885.41-11,499.87

Finding the Fourth Proportional to 20,931.06, 28,885.41 and 11,499.87

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Solution

The fourth proportional to 20,931.06, 28,885.41 and 11,499.87 is: 15,870.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.06 : 28,885.41 = 11,499.87 : x
  2. Step 2: Convert to fraction form
    20,931.06/28,885.41 = 11,499.87/x
  3. Step 3: Cross multiply
    20,931.06x = 28,885.41 × 11,499.87
  4. Step 4: Simplify right side
    20,931.06x = 332,178,459.90
  5. Step 5: Solve for x
    x = 332,178,459.90/20,931.06
  6. Step 6: Final answer
    x = 15,870.12

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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.