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Finding the Fourth Proportional to 665,356.86, 918,191.56 and 378,876.94

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Solution

The fourth proportional to 665,356.86, 918,191.56 and 378,876.94 is: 522,849.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,356.86 : 918,191.56 = 378,876.94 : x
  2. Step 2: Convert to fraction form
    665,356.86/918,191.56 = 378,876.94/x
  3. Step 3: Cross multiply
    665,356.86x = 918,191.56 × 378,876.94
  4. Step 4: Simplify right side
    665,356.86x = 347,881,611,751.97
  5. Step 5: Solve for x
    x = 347,881,611,751.97/665,356.86
  6. Step 6: Final answer
    x = 522,849.67

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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.