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Finding the Fourth Proportional to 14,515.50, 20,031.55 and 7,891.50

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Solution

The fourth proportional to 14,515.50, 20,031.55 and 7,891.50 is: 10,890.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,515.50 : 20,031.55 = 7,891.50 : x
  2. Step 2: Convert to fraction form
    14,515.50/20,031.55 = 7,891.50/x
  3. Step 3: Cross multiply
    14,515.50x = 20,031.55 × 7,891.50
  4. Step 4: Simplify right side
    14,515.50x = 158,078,976.83
  5. Step 5: Solve for x
    x = 158,078,976.83/14,515.50
  6. Step 6: Final answer
    x = 10,890.36

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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.