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Finding the Fourth Proportional to 124,420, 171,699.60 and 79,708

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Solution

The fourth proportional to 124,420, 171,699.60 and 79,708 is: 109,997.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,420 : 171,699.60 = 79,708 : x
  2. Step 2: Convert to fraction form
    124,420/171,699.60 = 79,708/x
  3. Step 3: Cross multiply
    124,420x = 171,699.60 × 79,708
  4. Step 4: Simplify right side
    124,420x = 13,685,831,716.80
  5. Step 5: Solve for x
    x = 13,685,831,716.80/124,420
  6. Step 6: Final answer
    x = 109,997.04

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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.