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Finding the Fourth Proportional to 642,470.40, 886,615.20 and 355,993.92

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Solution

The fourth proportional to 642,470.40, 886,615.20 and 355,993.92 is: 491,274.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,470.40 : 886,615.20 = 355,993.92 : x
  2. Step 2: Convert to fraction form
    642,470.40/886,615.20 = 355,993.92/x
  3. Step 3: Cross multiply
    642,470.40x = 886,615.20 × 355,993.92
  4. Step 4: Simplify right side
    642,470.40x = 315,629,620,579.58
  5. Step 5: Solve for x
    x = 315,629,620,579.58/642,470.40
  6. Step 6: Final answer
    x = 491,274.96

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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.