Home / 20,931.16-31,384.44-8,451.60

Finding the Fourth Proportional to 20,931.16, 31,384.44 and 8,451.60

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Solution

The fourth proportional to 20,931.16, 31,384.44 and 8,451.60 is: 12,672.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.16 : 31,384.44 = 8,451.60 : x
  2. Step 2: Convert to fraction form
    20,931.16/31,384.44 = 8,451.60/x
  3. Step 3: Cross multiply
    20,931.16x = 31,384.44 × 8,451.60
  4. Step 4: Simplify right side
    20,931.16x = 265,248,733.10
  5. Step 5: Solve for x
    x = 265,248,733.10/20,931.16
  6. Step 6: Final answer
    x = 12,672.43

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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.