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Finding the Fourth Proportional to 76,803.70, 115,205.55 and 21,399.70

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Solution

The fourth proportional to 76,803.70, 115,205.55 and 21,399.70 is: 32,099.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,803.70 : 115,205.55 = 21,399.70 : x
  2. Step 2: Convert to fraction form
    76,803.70/115,205.55 = 21,399.70/x
  3. Step 3: Cross multiply
    76,803.70x = 115,205.55 × 21,399.70
  4. Step 4: Simplify right side
    76,803.70x = 2,465,364,208.34
  5. Step 5: Solve for x
    x = 2,465,364,208.34/76,803.70
  6. Step 6: Final answer
    x = 32,099.55

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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.