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Finding the Fourth Proportional to 391,637.70, 587,448.30 and 211,808.88

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Solution

The fourth proportional to 391,637.70, 587,448.30 and 211,808.88 is: 317,708.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,637.70 : 587,448.30 = 211,808.88 : x
  2. Step 2: Convert to fraction form
    391,637.70/587,448.30 = 211,808.88/x
  3. Step 3: Cross multiply
    391,637.70x = 587,448.30 × 211,808.88
  4. Step 4: Simplify right side
    391,637.70x = 124,426,766,480.90
  5. Step 5: Solve for x
    x = 124,426,766,480.90/391,637.70
  6. Step 6: Final answer
    x = 317,708.86

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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.