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Finding the Fourth Proportional to 283,720.81, 391,529.91 and 154,660.72

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Solution

The fourth proportional to 283,720.81, 391,529.91 and 154,660.72 is: 213,429.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    283,720.81 : 391,529.91 = 154,660.72 : x
  2. Step 2: Convert to fraction form
    283,720.81/391,529.91 = 154,660.72/x
  3. Step 3: Cross multiply
    283,720.81x = 391,529.91 × 154,660.72
  4. Step 4: Simplify right side
    283,720.81x = 60,554,297,782.14
  5. Step 5: Solve for x
    x = 60,554,297,782.14/283,720.81
  6. Step 6: Final answer
    x = 213,429.17

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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.