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Finding the Fourth Proportional to 665,311.60, 918,131 and 378,831.92

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Solution

The fourth proportional to 665,311.60, 918,131 and 378,831.92 is: 522,788.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,311.60 : 918,131 = 378,831.92 : x
  2. Step 2: Convert to fraction form
    665,311.60/918,131 = 378,831.92/x
  3. Step 3: Cross multiply
    665,311.60x = 918,131 × 378,831.92
  4. Step 4: Simplify right side
    665,311.60x = 347,817,329,541.52
  5. Step 5: Solve for x
    x = 347,817,329,541.52/665,311.60
  6. Step 6: Final answer
    x = 522,788.61

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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.