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Finding the Fourth Proportional to 643,469.12, 887,999.12 and 353,095.66

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Solution

The fourth proportional to 643,469.12, 887,999.12 and 353,095.66 is: 487,278.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,469.12 : 887,999.12 = 353,095.66 : x
  2. Step 2: Convert to fraction form
    643,469.12/887,999.12 = 353,095.66/x
  3. Step 3: Cross multiply
    643,469.12x = 887,999.12 × 353,095.66
  4. Step 4: Simplify right side
    643,469.12x = 313,548,635,355.82
  5. Step 5: Solve for x
    x = 313,548,635,355.82/643,469.12
  6. Step 6: Final answer
    x = 487,278.45

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1.5x scale

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.