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Finding the Fourth Proportional to 391,544, 540,330.72 and 212,696

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Solution

The fourth proportional to 391,544, 540,330.72 and 212,696 is: 293,520.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,544 : 540,330.72 = 212,696 : x
  2. Step 2: Convert to fraction form
    391,544/540,330.72 = 212,696/x
  3. Step 3: Cross multiply
    391,544x = 540,330.72 × 212,696
  4. Step 4: Simplify right side
    391,544x = 114,926,182,821.12
  5. Step 5: Solve for x
    x = 114,926,182,821.12/391,544
  6. Step 6: Final answer
    x = 293,520.48

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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.