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Finding the Fourth Proportional to 124,426.64, 171,603 and 105,140

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Solution

The fourth proportional to 124,426.64, 171,603 and 105,140 is: 145,003.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,426.64 : 171,603 = 105,140 : x
  2. Step 2: Convert to fraction form
    124,426.64/171,603 = 105,140/x
  3. Step 3: Cross multiply
    124,426.64x = 171,603 × 105,140
  4. Step 4: Simplify right side
    124,426.64x = 18,042,339,420
  5. Step 5: Solve for x
    x = 18,042,339,420/124,426.64
  6. Step 6: Final answer
    x = 145,003.83

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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.