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Finding the Fourth Proportional to 727,155.60, 1,003,215 and 421,064.88

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Solution

The fourth proportional to 727,155.60, 1,003,215 and 421,064.88 is: 580,919.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    727,155.60 : 1,003,215 = 421,064.88 : x
  2. Step 2: Convert to fraction form
    727,155.60/1,003,215 = 421,064.88/x
  3. Step 3: Cross multiply
    727,155.60x = 1,003,215 × 421,064.88
  4. Step 4: Simplify right side
    727,155.60x = 422,418,603,589.20
  5. Step 5: Solve for x
    x = 422,418,603,589.20/727,155.60
  6. Step 6: Final answer
    x = 580,919.14

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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.