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Finding the Fourth Proportional to 76,679.70, 115,019.55 and 21,275.70

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Solution

The fourth proportional to 76,679.70, 115,019.55 and 21,275.70 is: 31,913.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,679.70 : 115,019.55 = 21,275.70 : x
  2. Step 2: Convert to fraction form
    76,679.70/115,019.55 = 21,275.70/x
  3. Step 3: Cross multiply
    76,679.70x = 115,019.55 × 21,275.70
  4. Step 4: Simplify right side
    76,679.70x = 2,447,121,439.94
  5. Step 5: Solve for x
    x = 2,447,121,439.94/76,679.70
  6. Step 6: Final answer
    x = 31,913.55

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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.