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Finding the Fourth Proportional to 391,070, 539,676.62 and 212,222

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Solution

The fourth proportional to 391,070, 539,676.62 and 212,222 is: 292,866.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,070 : 539,676.62 = 212,222 : x
  2. Step 2: Convert to fraction form
    391,070/539,676.62 = 212,222/x
  3. Step 3: Cross multiply
    391,070x = 539,676.62 × 212,222
  4. Step 4: Simplify right side
    391,070x = 114,531,251,649.64
  5. Step 5: Solve for x
    x = 114,531,251,649.64/391,070
  6. Step 6: Final answer
    x = 292,866.37

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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.