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Finding the Fourth Proportional to 21,613.68, 29,830.68 and 20,628.72

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Solution

The fourth proportional to 21,613.68, 29,830.68 and 20,628.72 is: 28,471.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,613.68 : 29,830.68 = 20,628.72 : x
  2. Step 2: Convert to fraction form
    21,613.68/29,830.68 = 20,628.72/x
  3. Step 3: Cross multiply
    21,613.68x = 29,830.68 × 20,628.72
  4. Step 4: Simplify right side
    21,613.68x = 615,368,745.13
  5. Step 5: Solve for x
    x = 615,368,745.13/21,613.68
  6. Step 6: Final answer
    x = 28,471.26

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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.