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Finding the Fourth Proportional to 15,613.80, 21,147.75 and 15,613.80

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Solution

The fourth proportional to 15,613.80, 21,147.75 and 15,613.80 is: 21,147.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,613.80 : 21,147.75 = 15,613.80 : x
  2. Step 2: Convert to fraction form
    15,613.80/21,147.75 = 15,613.80/x
  3. Step 3: Cross multiply
    15,613.80x = 21,147.75 × 15,613.80
  4. Step 4: Simplify right side
    15,613.80x = 330,196,738.95
  5. Step 5: Solve for x
    x = 330,196,738.95/15,613.80
  6. Step 6: Final answer
    x = 21,147.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.