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Finding the Fourth Proportional to 659,495.84, 910,021.52 and 391,172

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Solution

The fourth proportional to 659,495.84, 910,021.52 and 391,172 is: 539,768.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,495.84 : 910,021.52 = 391,172 : x
  2. Step 2: Convert to fraction form
    659,495.84/910,021.52 = 391,172/x
  3. Step 3: Cross multiply
    659,495.84x = 910,021.52 × 391,172
  4. Step 4: Simplify right side
    659,495.84x = 355,974,938,021.44
  5. Step 5: Solve for x
    x = 355,974,938,021.44/659,495.84
  6. Step 6: Final answer
    x = 539,768.28

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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.