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Finding the Fourth Proportional to 665,392.35, 918,240.45 and 378,912.51

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Solution

The fourth proportional to 665,392.35, 918,240.45 and 378,912.51 is: 522,898.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,392.35 : 918,240.45 = 378,912.51 : x
  2. Step 2: Convert to fraction form
    665,392.35/918,240.45 = 378,912.51/x
  3. Step 3: Cross multiply
    665,392.35x = 918,240.45 × 378,912.51
  4. Step 4: Simplify right side
    665,392.35x = 347,932,793,693.03
  5. Step 5: Solve for x
    x = 347,932,793,693.03/665,392.35
  6. Step 6: Final answer
    x = 522,898.70

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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.