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Finding the Fourth Proportional to 642,392.16, 886,489.70 and 355,906.50

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Solution

The fourth proportional to 642,392.16, 886,489.70 and 355,906.50 is: 491,144.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,392.16 : 886,489.70 = 355,906.50 : x
  2. Step 2: Convert to fraction form
    642,392.16/886,489.70 = 355,906.50/x
  3. Step 3: Cross multiply
    642,392.16x = 886,489.70 × 355,906.50
  4. Step 4: Simplify right side
    642,392.16x = 315,507,444,633.52
  5. Step 5: Solve for x
    x = 315,507,444,633.52/642,392.16
  6. Step 6: Final answer
    x = 491,144.61

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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.