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Finding the Fourth Proportional to 444,845.76, 611,896.32 and 390,128.64

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Solution

The fourth proportional to 444,845.76, 611,896.32 and 390,128.64 is: 536,631.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    444,845.76 : 611,896.32 = 390,128.64 : x
  2. Step 2: Convert to fraction form
    444,845.76/611,896.32 = 390,128.64/x
  3. Step 3: Cross multiply
    444,845.76x = 611,896.32 × 390,128.64
  4. Step 4: Simplify right side
    444,845.76x = 238,718,279,142.61
  5. Step 5: Solve for x
    x = 238,718,279,142.61/444,845.76
  6. Step 6: Final answer
    x = 536,631.57

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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.