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Finding the Fourth Proportional to 625,645.90, 863,726.34 and 489,390.34

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Solution

The fourth proportional to 625,645.90, 863,726.34 and 489,390.34 is: 675,620.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    625,645.90 : 863,726.34 = 489,390.34 : x
  2. Step 2: Convert to fraction form
    625,645.90/863,726.34 = 489,390.34/x
  3. Step 3: Cross multiply
    625,645.90x = 863,726.34 × 489,390.34
  4. Step 4: Simplify right side
    625,645.90x = 422,699,327,199.56
  5. Step 5: Solve for x
    x = 422,699,327,199.56/625,645.90
  6. Step 6: Final answer
    x = 675,620.71

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1.5x scale

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.