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Finding the Fourth Proportional to 138,883.62, 191,658.81 and 77,629.74

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Solution

The fourth proportional to 138,883.62, 191,658.81 and 77,629.74 is: 107,128.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,883.62 : 191,658.81 = 77,629.74 : x
  2. Step 2: Convert to fraction form
    138,883.62/191,658.81 = 77,629.74/x
  3. Step 3: Cross multiply
    138,883.62x = 191,658.81 × 77,629.74
  4. Step 4: Simplify right side
    138,883.62x = 14,878,423,589.01
  5. Step 5: Solve for x
    x = 14,878,423,589.01/138,883.62
  6. Step 6: Final answer
    x = 107,128.71

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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.