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Finding the Fourth Proportional to 15,079.50, 20,809.72 and 8,455.50

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Solution

The fourth proportional to 15,079.50, 20,809.72 and 8,455.50 is: 11,668.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,079.50 : 20,809.72 = 8,455.50 : x
  2. Step 2: Convert to fraction form
    15,079.50/20,809.72 = 8,455.50/x
  3. Step 3: Cross multiply
    15,079.50x = 20,809.72 × 8,455.50
  4. Step 4: Simplify right side
    15,079.50x = 175,956,587.46
  5. Step 5: Solve for x
    x = 175,956,587.46/15,079.50
  6. Step 6: Final answer
    x = 11,668.60

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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.