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Finding the Fourth Proportional to 221,505.60, 332,258.40 and 81,318.90

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Solution

The fourth proportional to 221,505.60, 332,258.40 and 81,318.90 is: 121,978.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,505.60 : 332,258.40 = 81,318.90 : x
  2. Step 2: Convert to fraction form
    221,505.60/332,258.40 = 81,318.90/x
  3. Step 3: Cross multiply
    221,505.60x = 332,258.40 × 81,318.90
  4. Step 4: Simplify right side
    221,505.60x = 27,018,887,603.76
  5. Step 5: Solve for x
    x = 27,018,887,603.76/221,505.60
  6. Step 6: Final answer
    x = 121,978.35

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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.