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Finding the Fourth Proportional to 391,116.71, 539,741.28 and 212,268.71

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Solution

The fourth proportional to 391,116.71, 539,741.28 and 212,268.71 is: 292,930.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,116.71 : 539,741.28 = 212,268.71 : x
  2. Step 2: Convert to fraction form
    391,116.71/539,741.28 = 212,268.71/x
  3. Step 3: Cross multiply
    391,116.71x = 539,741.28 × 212,268.71
  4. Step 4: Simplify right side
    391,116.71x = 114,570,185,239.35
  5. Step 5: Solve for x
    x = 114,570,185,239.35/391,116.71
  6. Step 6: Final answer
    x = 292,930.94

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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.