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Finding the Fourth Proportional to 485,695.48, 728,630.90 and 219,581.32

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Solution

The fourth proportional to 485,695.48, 728,630.90 and 219,581.32 is: 329,411.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,695.48 : 728,630.90 = 219,581.32 : x
  2. Step 2: Convert to fraction form
    485,695.48/728,630.90 = 219,581.32/x
  3. Step 3: Cross multiply
    485,695.48x = 728,630.90 × 219,581.32
  4. Step 4: Simplify right side
    485,695.48x = 159,993,734,814.79
  5. Step 5: Solve for x
    x = 159,993,734,814.79/485,695.48
  6. Step 6: Final answer
    x = 329,411.62

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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.