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Finding the Fourth Proportional to 15,210.90, 20,988.96 and 8,495.67

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Solution

The fourth proportional to 15,210.90, 20,988.96 and 8,495.67 is: 11,722.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,210.90 : 20,988.96 = 8,495.67 : x
  2. Step 2: Convert to fraction form
    15,210.90/20,988.96 = 8,495.67/x
  3. Step 3: Cross multiply
    15,210.90x = 20,988.96 × 8,495.67
  4. Step 4: Simplify right side
    15,210.90x = 178,315,277.80
  5. Step 5: Solve for x
    x = 178,315,277.80/15,210.90
  6. Step 6: Final answer
    x = 11,722.86

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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.