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Finding the Fourth Proportional to 665,357.64, 918,192.61 and 378,877.71

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Solution

The fourth proportional to 665,357.64, 918,192.61 and 378,877.71 is: 522,850.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,357.64 : 918,192.61 = 378,877.71 : x
  2. Step 2: Convert to fraction form
    665,357.64/918,192.61 = 378,877.71/x
  3. Step 3: Cross multiply
    665,357.64x = 918,192.61 × 378,877.71
  4. Step 4: Simplify right side
    665,357.64x = 347,882,713,415.72
  5. Step 5: Solve for x
    x = 347,882,713,415.72/665,357.64
  6. Step 6: Final answer
    x = 522,850.71

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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.