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Finding the Fourth Proportional to 28,687.60, 43,031.40 and 20,911.60

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Solution

The fourth proportional to 28,687.60, 43,031.40 and 20,911.60 is: 31,367.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,687.60 : 43,031.40 = 20,911.60 : x
  2. Step 2: Convert to fraction form
    28,687.60/43,031.40 = 20,911.60/x
  3. Step 3: Cross multiply
    28,687.60x = 43,031.40 × 20,911.60
  4. Step 4: Simplify right side
    28,687.60x = 899,855,424.24
  5. Step 5: Solve for x
    x = 899,855,424.24/28,687.60
  6. Step 6: Final answer
    x = 31,367.40

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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.