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Finding the Fourth Proportional to 123,490.78, 185,243.40 and 34,751.20

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Solution

The fourth proportional to 123,490.78, 185,243.40 and 34,751.20 is: 52,128.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,490.78 : 185,243.40 = 34,751.20 : x
  2. Step 2: Convert to fraction form
    123,490.78/185,243.40 = 34,751.20/x
  3. Step 3: Cross multiply
    123,490.78x = 185,243.40 × 34,751.20
  4. Step 4: Simplify right side
    123,490.78x = 6,437,430,442.08
  5. Step 5: Solve for x
    x = 6,437,430,442.08/123,490.78
  6. Step 6: Final answer
    x = 52,128.83

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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.