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Finding the Fourth Proportional to 391,903.10, 587,708.85 and 155,196.80

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Solution

The fourth proportional to 391,903.10, 587,708.85 and 155,196.80 is: 232,737.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,903.10 : 587,708.85 = 155,196.80 : x
  2. Step 2: Convert to fraction form
    391,903.10/587,708.85 = 155,196.80/x
  3. Step 3: Cross multiply
    391,903.10x = 587,708.85 × 155,196.80
  4. Step 4: Simplify right side
    391,903.10x = 91,210,532,851.68
  5. Step 5: Solve for x
    x = 91,210,532,851.68/391,903.10
  6. Step 6: Final answer
    x = 232,737.46

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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.