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Finding the Fourth Proportional to 123,508.65, 170,442.05 and 66,920.02

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Solution

The fourth proportional to 123,508.65, 170,442.05 and 66,920.02 is: 92,349.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,508.65 : 170,442.05 = 66,920.02 : x
  2. Step 2: Convert to fraction form
    123,508.65/170,442.05 = 66,920.02/x
  3. Step 3: Cross multiply
    123,508.65x = 170,442.05 × 66,920.02
  4. Step 4: Simplify right side
    123,508.65x = 11,405,985,394.84
  5. Step 5: Solve for x
    x = 11,405,985,394.84/123,508.65
  6. Step 6: Final answer
    x = 92,349.69

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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.