Home / 20,931.54-28,885.44-11,979

Finding the Fourth Proportional to 20,931.54, 28,885.44 and 11,979

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Solution

The fourth proportional to 20,931.54, 28,885.44 and 11,979 is: 16,530.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.54 : 28,885.44 = 11,979 : x
  2. Step 2: Convert to fraction form
    20,931.54/28,885.44 = 11,979/x
  3. Step 3: Cross multiply
    20,931.54x = 28,885.44 × 11,979
  4. Step 4: Simplify right side
    20,931.54x = 346,018,685.76
  5. Step 5: Solve for x
    x = 346,018,685.76/20,931.54
  6. Step 6: Final answer
    x = 16,530.97

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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.