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Finding the Fourth Proportional to 72,770.40, 109,110.78 and 28,345.41

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Solution

The fourth proportional to 72,770.40, 109,110.78 and 28,345.41 is: 42,500.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,770.40 : 109,110.78 = 28,345.41 : x
  2. Step 2: Convert to fraction form
    72,770.40/109,110.78 = 28,345.41/x
  3. Step 3: Cross multiply
    72,770.40x = 109,110.78 × 28,345.41
  4. Step 4: Simplify right side
    72,770.40x = 3,092,789,794.52
  5. Step 5: Solve for x
    x = 3,092,789,794.52/72,770.40
  6. Step 6: Final answer
    x = 42,500.66

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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.