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Finding the Fourth Proportional to 642,778.90, 887,015.67 and 352,380.53

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Solution

The fourth proportional to 642,778.90, 887,015.67 and 352,380.53 is: 486,274.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,778.90 : 887,015.67 = 352,380.53 : x
  2. Step 2: Convert to fraction form
    642,778.90/887,015.67 = 352,380.53/x
  3. Step 3: Cross multiply
    642,778.90x = 887,015.67 × 352,380.53
  4. Step 4: Simplify right side
    642,778.90x = 312,567,055,910.37
  5. Step 5: Solve for x
    x = 312,567,055,910.37/642,778.90
  6. Step 6: Final answer
    x = 486,274.61

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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.