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Finding the Fourth Proportional to 489,219.75, 675,124.47 and 285,410.79

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Solution

The fourth proportional to 489,219.75, 675,124.47 and 285,410.79 is: 393,867.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,219.75 : 675,124.47 = 285,410.79 : x
  2. Step 2: Convert to fraction form
    489,219.75/675,124.47 = 285,410.79/x
  3. Step 3: Cross multiply
    489,219.75x = 675,124.47 × 285,410.79
  4. Step 4: Simplify right side
    489,219.75x = 192,687,808,331.03
  5. Step 5: Solve for x
    x = 192,687,808,331.03/489,219.75
  6. Step 6: Final answer
    x = 393,867.60

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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.