Home / 20,811.60-31,168.08-11,931.76

Finding the Fourth Proportional to 20,811.60, 31,168.08 and 11,931.76

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Solution

The fourth proportional to 20,811.60, 31,168.08 and 11,931.76 is: 17,869.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.60 : 31,168.08 = 11,931.76 : x
  2. Step 2: Convert to fraction form
    20,811.60/31,168.08 = 11,931.76/x
  3. Step 3: Cross multiply
    20,811.60x = 31,168.08 × 11,931.76
  4. Step 4: Simplify right side
    20,811.60x = 371,890,050.22
  5. Step 5: Solve for x
    x = 371,890,050.22/20,811.60
  6. Step 6: Final answer
    x = 17,869.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.