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Finding the Fourth Proportional to 128,629.66, 177,452.39 and 77,613.94

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Solution

The fourth proportional to 128,629.66, 177,452.39 and 77,613.94 is: 107,073.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,629.66 : 177,452.39 = 77,613.94 : x
  2. Step 2: Convert to fraction form
    128,629.66/177,452.39 = 77,613.94/x
  3. Step 3: Cross multiply
    128,629.66x = 177,452.39 × 77,613.94
  4. Step 4: Simplify right side
    128,629.66x = 13,772,778,131.42
  5. Step 5: Solve for x
    x = 13,772,778,131.42/128,629.66
  6. Step 6: Final answer
    x = 107,073.11

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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.