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Finding the Fourth Proportional to 642,539.18, 886,709.32 and 356,064.05

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Solution

The fourth proportional to 642,539.18, 886,709.32 and 356,064.05 is: 491,371.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,539.18 : 886,709.32 = 356,064.05 : x
  2. Step 2: Convert to fraction form
    642,539.18/886,709.32 = 356,064.05/x
  3. Step 3: Cross multiply
    642,539.18x = 886,709.32 × 356,064.05
  4. Step 4: Simplify right side
    642,539.18x = 315,725,311,651.95
  5. Step 5: Solve for x
    x = 315,725,311,651.95/642,539.18
  6. Step 6: Final answer
    x = 491,371.30

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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.