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Finding the Fourth Proportional to 391,393, 587,089.50 and 95,905

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Solution

The fourth proportional to 391,393, 587,089.50 and 95,905 is: 143,857.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,393 : 587,089.50 = 95,905 : x
  2. Step 2: Convert to fraction form
    391,393/587,089.50 = 95,905/x
  3. Step 3: Cross multiply
    391,393x = 587,089.50 × 95,905
  4. Step 4: Simplify right side
    391,393x = 56,304,818,497.50
  5. Step 5: Solve for x
    x = 56,304,818,497.50/391,393
  6. Step 6: Final answer
    x = 143,857.50

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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.