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Finding the Fourth Proportional to 722,209.10, 996,647.92 and 399,919.20

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Solution

The fourth proportional to 722,209.10, 996,647.92 and 399,919.20 is: 551,888.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    722,209.10 : 996,647.92 = 399,919.20 : x
  2. Step 2: Convert to fraction form
    722,209.10/996,647.92 = 399,919.20/x
  3. Step 3: Cross multiply
    722,209.10x = 996,647.92 × 399,919.20
  4. Step 4: Simplify right side
    722,209.10x = 398,578,638,848.06
  5. Step 5: Solve for x
    x = 398,578,638,848.06/722,209.10
  6. Step 6: Final answer
    x = 551,888.14

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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.