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Finding the Fourth Proportional to 642,351.55, 886,410.23 and 355,854.55

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Solution

The fourth proportional to 642,351.55, 886,410.23 and 355,854.55 is: 491,059.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,351.55 : 886,410.23 = 355,854.55 : x
  2. Step 2: Convert to fraction form
    642,351.55/886,410.23 = 355,854.55/x
  3. Step 3: Cross multiply
    642,351.55x = 886,410.23 × 355,854.55
  4. Step 4: Simplify right side
    642,351.55x = 315,433,113,512.05
  5. Step 5: Solve for x
    x = 315,433,113,512.05/642,351.55
  6. Step 6: Final answer
    x = 491,059.94

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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.