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Finding the Fourth Proportional to 81,390.78, 122,127.62 and 47,705.40

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Solution

The fourth proportional to 81,390.78, 122,127.62 and 47,705.40 is: 71,582.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,390.78 : 122,127.62 = 47,705.40 : x
  2. Step 2: Convert to fraction form
    81,390.78/122,127.62 = 47,705.40/x
  3. Step 3: Cross multiply
    81,390.78x = 122,127.62 × 47,705.40
  4. Step 4: Simplify right side
    81,390.78x = 5,826,146,724.62
  5. Step 5: Solve for x
    x = 5,826,146,724.62/81,390.78
  6. Step 6: Final answer
    x = 71,582.39

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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.