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Finding the Fourth Proportional to 642,447.90, 886,540.94 and 355,950.90

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Solution

The fourth proportional to 642,447.90, 886,540.94 and 355,950.90 is: 491,191.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,447.90 : 886,540.94 = 355,950.90 : x
  2. Step 2: Convert to fraction form
    642,447.90/886,540.94 = 355,950.90/x
  3. Step 3: Cross multiply
    642,447.90x = 886,540.94 × 355,950.90
  4. Step 4: Simplify right side
    642,447.90x = 315,565,045,479.85
  5. Step 5: Solve for x
    x = 315,565,045,479.85/642,447.90
  6. Step 6: Final answer
    x = 491,191.65

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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.