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Finding the Fourth Proportional to 642,403.68, 886,505.56 and 355,918

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Solution

The fourth proportional to 642,403.68, 886,505.56 and 355,918 is: 491,160.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,403.68 : 886,505.56 = 355,918 : x
  2. Step 2: Convert to fraction form
    642,403.68/886,505.56 = 355,918/x
  3. Step 3: Cross multiply
    642,403.68x = 886,505.56 × 355,918
  4. Step 4: Simplify right side
    642,403.68x = 315,523,285,904.08
  5. Step 5: Solve for x
    x = 315,523,285,904.08/642,403.68
  6. Step 6: Final answer
    x = 491,160.46

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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.