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Finding the Fourth Proportional to 666,107.72, 999,489.60 and 311,070.20

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Solution

The fourth proportional to 666,107.72, 999,489.60 and 311,070.20 is: 466,758.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,107.72 : 999,489.60 = 311,070.20 : x
  2. Step 2: Convert to fraction form
    666,107.72/999,489.60 = 311,070.20/x
  3. Step 3: Cross multiply
    666,107.72x = 999,489.60 × 311,070.20
  4. Step 4: Simplify right side
    666,107.72x = 310,911,429,769.92
  5. Step 5: Solve for x
    x = 310,911,429,769.92/666,107.72
  6. Step 6: Final answer
    x = 466,758.48

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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.