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Finding the Fourth Proportional to 128,658.53, 177,548.83 and 78,357.53

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Solution

The fourth proportional to 128,658.53, 177,548.83 and 78,357.53 is: 108,133.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,658.53 : 177,548.83 = 78,357.53 : x
  2. Step 2: Convert to fraction form
    128,658.53/177,548.83 = 78,357.53/x
  3. Step 3: Cross multiply
    128,658.53x = 177,548.83 × 78,357.53
  4. Step 4: Simplify right side
    128,658.53x = 13,912,288,021.17
  5. Step 5: Solve for x
    x = 13,912,288,021.17/128,658.53
  6. Step 6: Final answer
    x = 108,133.43

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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.