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Finding the Fourth Proportional to 611,081.20, 916,656.81 and 161,790.40

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Solution

The fourth proportional to 611,081.20, 916,656.81 and 161,790.40 is: 242,694.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,081.20 : 916,656.81 = 161,790.40 : x
  2. Step 2: Convert to fraction form
    611,081.20/916,656.81 = 161,790.40/x
  3. Step 3: Cross multiply
    611,081.20x = 916,656.81 × 161,790.40
  4. Step 4: Simplify right side
    611,081.20x = 148,306,267,369.34
  5. Step 5: Solve for x
    x = 148,306,267,369.34/611,081.20
  6. Step 6: Final answer
    x = 242,694.86

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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.