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Finding the Fourth Proportional to 15,137.66, 20,890.07 and 8,423.57

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Solution

The fourth proportional to 15,137.66, 20,890.07 and 8,423.57 is: 11,624.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,137.66 : 20,890.07 = 8,423.57 : x
  2. Step 2: Convert to fraction form
    15,137.66/20,890.07 = 8,423.57/x
  3. Step 3: Cross multiply
    15,137.66x = 20,890.07 × 8,423.57
  4. Step 4: Simplify right side
    15,137.66x = 175,968,966.95
  5. Step 5: Solve for x
    x = 175,968,966.95/15,137.66
  6. Step 6: Final answer
    x = 11,624.58

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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.