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Finding the Fourth Proportional to 642,390.90, 886,462.40 and 355,893.90

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Solution

The fourth proportional to 642,390.90, 886,462.40 and 355,893.90 is: 491,113.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,390.90 : 886,462.40 = 355,893.90 : x
  2. Step 2: Convert to fraction form
    642,390.90/886,462.40 = 355,893.90/x
  3. Step 3: Cross multiply
    642,390.90x = 886,462.40 × 355,893.90
  4. Step 4: Simplify right side
    642,390.90x = 315,486,560,739.36
  5. Step 5: Solve for x
    x = 315,486,560,739.36/642,390.90
  6. Step 6: Final answer
    x = 491,113.06

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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.