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Finding the Fourth Proportional to 391,728.40, 587,644.89 and 155,015.71

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Solution

The fourth proportional to 391,728.40, 587,644.89 and 155,015.71 is: 232,544.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,728.40 : 587,644.89 = 155,015.71 : x
  2. Step 2: Convert to fraction form
    391,728.40/587,644.89 = 155,015.71/x
  3. Step 3: Cross multiply
    391,728.40x = 587,644.89 × 155,015.71
  4. Step 4: Simplify right side
    391,728.40x = 91,094,189,851.22
  5. Step 5: Solve for x
    x = 91,094,189,851.22/391,728.40
  6. Step 6: Final answer
    x = 232,544.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.