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Finding the Fourth Proportional to 128,530.20, 192,737.70 and 49,618.20

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Solution

The fourth proportional to 128,530.20, 192,737.70 and 49,618.20 is: 74,405.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,530.20 : 192,737.70 = 49,618.20 : x
  2. Step 2: Convert to fraction form
    128,530.20/192,737.70 = 49,618.20/x
  3. Step 3: Cross multiply
    128,530.20x = 192,737.70 × 49,618.20
  4. Step 4: Simplify right side
    128,530.20x = 9,563,297,746.14
  5. Step 5: Solve for x
    x = 9,563,297,746.14/128,530.20
  6. Step 6: Final answer
    x = 74,405.06

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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.