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Finding the Fourth Proportional to 72,990.21, 100,753.80 and 56,825.49

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Solution

The fourth proportional to 72,990.21, 100,753.80 and 56,825.49 is: 78,440.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,990.21 : 100,753.80 = 56,825.49 : x
  2. Step 2: Convert to fraction form
    72,990.21/100,753.80 = 56,825.49/x
  3. Step 3: Cross multiply
    72,990.21x = 100,753.80 × 56,825.49
  4. Step 4: Simplify right side
    72,990.21x = 5,725,384,054.36
  5. Step 5: Solve for x
    x = 5,725,384,054.36/72,990.21
  6. Step 6: Final answer
    x = 78,440.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.