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Finding the Fourth Proportional to 128,351.42, 177,053.86 and 74,630.50

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Solution

The fourth proportional to 128,351.42, 177,053.86 and 74,630.50 is: 102,948.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,351.42 : 177,053.86 = 74,630.50 : x
  2. Step 2: Convert to fraction form
    128,351.42/177,053.86 = 74,630.50/x
  3. Step 3: Cross multiply
    128,351.42x = 177,053.86 × 74,630.50
  4. Step 4: Simplify right side
    128,351.42x = 13,213,618,098.73
  5. Step 5: Solve for x
    x = 13,213,618,098.73/128,351.42
  6. Step 6: Final answer
    x = 102,948.75

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1.5x scale

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.