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Finding the Fourth Proportional to 71,390.91, 107,099.88 and 28,699.64

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Solution

The fourth proportional to 71,390.91, 107,099.88 and 28,699.64 is: 43,054.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,390.91 : 107,099.88 = 28,699.64 : x
  2. Step 2: Convert to fraction form
    71,390.91/107,099.88 = 28,699.64/x
  3. Step 3: Cross multiply
    71,390.91x = 107,099.88 × 28,699.64
  4. Step 4: Simplify right side
    71,390.91x = 3,073,728,267.79
  5. Step 5: Solve for x
    x = 3,073,728,267.79/71,390.91
  6. Step 6: Final answer
    x = 43,054.90

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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.