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Finding the Fourth Proportional to 391,124, 539,751.20 and 212,276

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Solution

The fourth proportional to 391,124, 539,751.20 and 212,276 is: 292,940.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,124 : 539,751.20 = 212,276 : x
  2. Step 2: Convert to fraction form
    391,124/539,751.20 = 212,276/x
  3. Step 3: Cross multiply
    391,124x = 539,751.20 × 212,276
  4. Step 4: Simplify right side
    391,124x = 114,576,225,731.20
  5. Step 5: Solve for x
    x = 114,576,225,731.20/391,124
  6. Step 6: Final answer
    x = 292,940.92

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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.