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Finding the Fourth Proportional to 489,407.09, 675,378.81 and 285,442.00

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Solution

The fourth proportional to 489,407.09, 675,378.81 and 285,442.00 is: 393,908.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,407.09 : 675,378.81 = 285,442.00 : x
  2. Step 2: Convert to fraction form
    489,407.09/675,378.81 = 285,442.00/x
  3. Step 3: Cross multiply
    489,407.09x = 675,378.81 × 285,442.00
  4. Step 4: Simplify right side
    489,407.09x = 192,781,476,595.57
  5. Step 5: Solve for x
    x = 192,781,476,595.57/489,407.09
  6. Step 6: Final answer
    x = 393,908.23

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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.