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Finding the Fourth Proportional to 28,807.35, 43,181.40 and 20,890.10

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Solution

The fourth proportional to 28,807.35, 43,181.40 and 20,890.10 is: 31,313.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,807.35 : 43,181.40 = 20,890.10 : x
  2. Step 2: Convert to fraction form
    28,807.35/43,181.40 = 20,890.10/x
  3. Step 3: Cross multiply
    28,807.35x = 43,181.40 × 20,890.10
  4. Step 4: Simplify right side
    28,807.35x = 902,063,950.43
  5. Step 5: Solve for x
    x = 902,063,950.43/28,807.35
  6. Step 6: Final answer
    x = 31,313.68

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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.