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Finding the Fourth Proportional to 123,486.90, 170,411.89 and 66,898.26

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Solution

The fourth proportional to 123,486.90, 170,411.89 and 66,898.26 is: 92,319.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,486.90 : 170,411.89 = 66,898.26 : x
  2. Step 2: Convert to fraction form
    123,486.90/170,411.89 = 66,898.26/x
  3. Step 3: Cross multiply
    123,486.90x = 170,411.89 × 66,898.26
  4. Step 4: Simplify right side
    123,486.90x = 11,400,258,924.31
  5. Step 5: Solve for x
    x = 11,400,258,924.31/123,486.90
  6. Step 6: Final answer
    x = 92,319.58

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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.