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Finding the Fourth Proportional to 479,298.72, 661,509.78 and 285,730.18

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Solution

The fourth proportional to 479,298.72, 661,509.78 and 285,730.18 is: 394,353.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,298.72 : 661,509.78 = 285,730.18 : x
  2. Step 2: Convert to fraction form
    479,298.72/661,509.78 = 285,730.18/x
  3. Step 3: Cross multiply
    479,298.72x = 661,509.78 × 285,730.18
  4. Step 4: Simplify right side
    479,298.72x = 189,013,308,511.16
  5. Step 5: Solve for x
    x = 189,013,308,511.16/479,298.72
  6. Step 6: Final answer
    x = 394,353.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.