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Finding the Fourth Proportional to 28,651.16, 42,935.20 and 20,347.44

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Solution

The fourth proportional to 28,651.16, 42,935.20 and 20,347.44 is: 30,491.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,651.16 : 42,935.20 = 20,347.44 : x
  2. Step 2: Convert to fraction form
    28,651.16/42,935.20 = 20,347.44/x
  3. Step 3: Cross multiply
    28,651.16x = 42,935.20 × 20,347.44
  4. Step 4: Simplify right side
    28,651.16x = 873,621,405.89
  5. Step 5: Solve for x
    x = 873,621,405.89/28,651.16
  6. Step 6: Final answer
    x = 30,491.66

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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.