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Finding the Fourth Proportional to 642,208.71, 886,277.19 and 355,728.76

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Solution

The fourth proportional to 642,208.71, 886,277.19 and 355,728.76 is: 490,921.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,208.71 : 886,277.19 = 355,728.76 : x
  2. Step 2: Convert to fraction form
    642,208.71/886,277.19 = 355,728.76/x
  3. Step 3: Cross multiply
    642,208.71x = 886,277.19 × 355,728.76
  4. Step 4: Simplify right side
    642,208.71x = 315,274,285,814.98
  5. Step 5: Solve for x
    x = 315,274,285,814.98/642,208.71
  6. Step 6: Final answer
    x = 490,921.85

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Double scale
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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.