Home / 128,839.40-193,355.10-66,477.80

Finding the Fourth Proportional to 128,839.40, 193,355.10 and 66,477.80

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Solution

The fourth proportional to 128,839.40, 193,355.10 and 66,477.80 is: 99,766.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,839.40 : 193,355.10 = 66,477.80 : x
  2. Step 2: Convert to fraction form
    128,839.40/193,355.10 = 66,477.80/x
  3. Step 3: Cross multiply
    128,839.40x = 193,355.10 × 66,477.80
  4. Step 4: Simplify right side
    128,839.40x = 12,853,821,666.78
  5. Step 5: Solve for x
    x = 12,853,821,666.78/128,839.40
  6. Step 6: Final answer
    x = 99,766.23

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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.