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Finding the Fourth Proportional to 81,390.70, 122,100.45 and 28,830.70

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Solution

The fourth proportional to 81,390.70, 122,100.45 and 28,830.70 is: 43,251.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,390.70 : 122,100.45 = 28,830.70 : x
  2. Step 2: Convert to fraction form
    81,390.70/122,100.45 = 28,830.70/x
  3. Step 3: Cross multiply
    81,390.70x = 122,100.45 × 28,830.70
  4. Step 4: Simplify right side
    81,390.70x = 3,520,241,443.82
  5. Step 5: Solve for x
    x = 3,520,241,443.82/81,390.70
  6. Step 6: Final answer
    x = 43,251.15

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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.