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Finding the Fourth Proportional to 221,345.60, 331,816.80 and 81,070.40

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Solution

The fourth proportional to 221,345.60, 331,816.80 and 81,070.40 is: 121,531.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,345.60 : 331,816.80 = 81,070.40 : x
  2. Step 2: Convert to fraction form
    221,345.60/331,816.80 = 81,070.40/x
  3. Step 3: Cross multiply
    221,345.60x = 331,816.80 × 81,070.40
  4. Step 4: Simplify right side
    221,345.60x = 26,900,520,702.72
  5. Step 5: Solve for x
    x = 26,900,520,702.72/221,345.60
  6. Step 6: Final answer
    x = 121,531.76

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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.