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Finding the Fourth Proportional to 391,038.66, 539,631.45 and 212,190.66

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Solution

The fourth proportional to 391,038.66, 539,631.45 and 212,190.66 is: 292,822.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,038.66 : 539,631.45 = 212,190.66 : x
  2. Step 2: Convert to fraction form
    391,038.66/539,631.45 = 212,190.66/x
  3. Step 3: Cross multiply
    391,038.66x = 539,631.45 × 212,190.66
  4. Step 4: Simplify right side
    391,038.66x = 114,504,753,532.26
  5. Step 5: Solve for x
    x = 114,504,753,532.26/391,038.66
  6. Step 6: Final answer
    x = 292,822.08

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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.