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Finding the Fourth Proportional to 28,649.16, 42,932.20 and 20,345.44

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Solution

The fourth proportional to 28,649.16, 42,932.20 and 20,345.44 is: 30,488.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,649.16 : 42,932.20 = 20,345.44 : x
  2. Step 2: Convert to fraction form
    28,649.16/42,932.20 = 20,345.44/x
  3. Step 3: Cross multiply
    28,649.16x = 42,932.20 × 20,345.44
  4. Step 4: Simplify right side
    28,649.16x = 873,474,499.17
  5. Step 5: Solve for x
    x = 873,474,499.17/28,649.16
  6. Step 6: Final answer
    x = 30,488.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.