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Finding the Fourth Proportional to 642,474.99, 886,620.74 and 355,999.86

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Solution

The fourth proportional to 642,474.99, 886,620.74 and 355,999.86 is: 491,282.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,474.99 : 886,620.74 = 355,999.86 : x
  2. Step 2: Convert to fraction form
    642,474.99/886,620.74 = 355,999.86/x
  3. Step 3: Cross multiply
    642,474.99x = 886,620.74 × 355,999.86
  4. Step 4: Simplify right side
    642,474.99x = 315,636,857,533.10
  5. Step 5: Solve for x
    x = 315,636,857,533.10/642,474.99
  6. Step 6: Final answer
    x = 491,282.72

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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.