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Finding the Fourth Proportional to 642,539.66, 886,709.94 and 356,064.53

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Solution

The fourth proportional to 642,539.66, 886,709.94 and 356,064.53 is: 491,371.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,539.66 : 886,709.94 = 356,064.53 : x
  2. Step 2: Convert to fraction form
    642,539.66/886,709.94 = 356,064.53/x
  3. Step 3: Cross multiply
    642,539.66x = 886,709.94 × 356,064.53
  4. Step 4: Simplify right side
    642,539.66x = 315,725,958,032.43
  5. Step 5: Solve for x
    x = 315,725,958,032.43/642,539.66
  6. Step 6: Final answer
    x = 491,371.94

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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.