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Finding the Fourth Proportional to 21,077.88, 31,620.24 and 7,931.28

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Solution

The fourth proportional to 21,077.88, 31,620.24 and 7,931.28 is: 11,898.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,077.88 : 31,620.24 = 7,931.28 : x
  2. Step 2: Convert to fraction form
    21,077.88/31,620.24 = 7,931.28/x
  3. Step 3: Cross multiply
    21,077.88x = 31,620.24 × 7,931.28
  4. Step 4: Simplify right side
    21,077.88x = 250,788,977.11
  5. Step 5: Solve for x
    x = 250,788,977.11/21,077.88
  6. Step 6: Final answer
    x = 11,898.21

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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.