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Finding the Fourth Proportional to 21,079.31, 31,620.20 and 7,931.79

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Solution

The fourth proportional to 21,079.31, 31,620.20 and 7,931.79 is: 11,898.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,079.31 : 31,620.20 = 7,931.79 : x
  2. Step 2: Convert to fraction form
    21,079.31/31,620.20 = 7,931.79/x
  3. Step 3: Cross multiply
    21,079.31x = 31,620.20 × 7,931.79
  4. Step 4: Simplify right side
    21,079.31x = 250,804,746.50
  5. Step 5: Solve for x
    x = 250,804,746.50/21,079.31
  6. Step 6: Final answer
    x = 11,898.15

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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.