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Finding the Fourth Proportional to 642,639.45, 886,842.53 and 356,178.03

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Solution

The fourth proportional to 642,639.45, 886,842.53 and 356,178.03 is: 491,525.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,639.45 : 886,842.53 = 356,178.03 : x
  2. Step 2: Convert to fraction form
    642,639.45/886,842.53 = 356,178.03/x
  3. Step 3: Cross multiply
    642,639.45x = 886,842.53 × 356,178.03
  4. Step 4: Simplify right side
    642,639.45x = 315,873,823,474.73
  5. Step 5: Solve for x
    x = 315,873,823,474.73/642,639.45
  6. Step 6: Final answer
    x = 491,525.73

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1.5x scale

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.