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Finding the Fourth Proportional to 368,704.31, 553,058.21 and 128,817.20

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Solution

The fourth proportional to 368,704.31, 553,058.21 and 128,817.20 is: 193,226.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    368,704.31 : 553,058.21 = 128,817.20 : x
  2. Step 2: Convert to fraction form
    368,704.31/553,058.21 = 128,817.20/x
  3. Step 3: Cross multiply
    368,704.31x = 553,058.21 × 128,817.20
  4. Step 4: Simplify right side
    368,704.31x = 71,243,411,753.90
  5. Step 5: Solve for x
    x = 71,243,411,753.90/368,704.31
  6. Step 6: Final answer
    x = 193,226.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.