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Finding the Fourth Proportional to 548,866.90, 821,696.55 and 391,402.90

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Solution

The fourth proportional to 548,866.90, 821,696.55 and 391,402.90 is: 585,960.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    548,866.90 : 821,696.55 = 391,402.90 : x
  2. Step 2: Convert to fraction form
    548,866.90/821,696.55 = 391,402.90/x
  3. Step 3: Cross multiply
    548,866.90x = 821,696.55 × 391,402.90
  4. Step 4: Simplify right side
    548,866.90x = 321,614,412,590.00
  5. Step 5: Solve for x
    x = 321,614,412,590.00/548,866.90
  6. Step 6: Final answer
    x = 585,960.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.