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Finding the Fourth Proportional to 642,390.66, 886,487.63 and 355,905

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Solution

The fourth proportional to 642,390.66, 886,487.63 and 355,905 is: 491,142.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,390.66 : 886,487.63 = 355,905 : x
  2. Step 2: Convert to fraction form
    642,390.66/886,487.63 = 355,905/x
  3. Step 3: Cross multiply
    642,390.66x = 886,487.63 × 355,905
  4. Step 4: Simplify right side
    642,390.66x = 315,505,378,175.63
  5. Step 5: Solve for x
    x = 315,505,378,175.63/642,390.66
  6. Step 6: Final answer
    x = 491,142.54

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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.