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Finding the Fourth Proportional to 642,388.90, 886,459.64 and 355,891.90

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Solution

The fourth proportional to 642,388.90, 886,459.64 and 355,891.90 is: 491,110.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,388.90 : 886,459.64 = 355,891.90 : x
  2. Step 2: Convert to fraction form
    642,388.90/886,459.64 = 355,891.90/x
  3. Step 3: Cross multiply
    642,388.90x = 886,459.64 × 355,891.90
  4. Step 4: Simplify right side
    642,388.90x = 315,483,805,552.92
  5. Step 5: Solve for x
    x = 315,483,805,552.92/642,388.90
  6. Step 6: Final answer
    x = 491,110.30

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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.