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Finding the Fourth Proportional to 15,137.61, 20,890.70 and 8,423.88

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Solution

The fourth proportional to 15,137.61, 20,890.70 and 8,423.88 is: 11,625.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,137.61 : 20,890.70 = 8,423.88 : x
  2. Step 2: Convert to fraction form
    15,137.61/20,890.70 = 8,423.88/x
  3. Step 3: Cross multiply
    15,137.61x = 20,890.70 × 8,423.88
  4. Step 4: Simplify right side
    15,137.61x = 175,980,707.80
  5. Step 5: Solve for x
    x = 175,980,707.80/15,137.61
  6. Step 6: Final answer
    x = 11,625.40

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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.