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Finding the Fourth Proportional to 15,209.90, 20,987.58 and 8,494.67

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Solution

The fourth proportional to 15,209.90, 20,987.58 and 8,494.67 is: 11,721.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,209.90 : 20,987.58 = 8,494.67 : x
  2. Step 2: Convert to fraction form
    15,209.90/20,987.58 = 8,494.67/x
  3. Step 3: Cross multiply
    15,209.90x = 20,987.58 × 8,494.67
  4. Step 4: Simplify right side
    15,209.90x = 178,282,461.26
  5. Step 5: Solve for x
    x = 178,282,461.26/15,209.90
  6. Step 6: Final answer
    x = 11,721.48

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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.