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Finding the Fourth Proportional to 644,990.32, 890,063.94 and 354,599.77

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Solution

The fourth proportional to 644,990.32, 890,063.94 and 354,599.77 is: 489,335.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,990.32 : 890,063.94 = 354,599.77 : x
  2. Step 2: Convert to fraction form
    644,990.32/890,063.94 = 354,599.77/x
  3. Step 3: Cross multiply
    644,990.32x = 890,063.94 × 354,599.77
  4. Step 4: Simplify right side
    644,990.32x = 315,616,468,409.29
  5. Step 5: Solve for x
    x = 315,616,468,409.29/644,990.32
  6. Step 6: Final answer
    x = 489,335.20

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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.