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Finding the Fourth Proportional to 665,639.64, 998,455.76 and 266,372.80

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Solution

The fourth proportional to 665,639.64, 998,455.76 and 266,372.80 is: 399,557.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,639.64 : 998,455.76 = 266,372.80 : x
  2. Step 2: Convert to fraction form
    665,639.64/998,455.76 = 266,372.80/x
  3. Step 3: Cross multiply
    665,639.64x = 998,455.76 × 266,372.80
  4. Step 4: Simplify right side
    665,639.64x = 265,961,456,467.33
  5. Step 5: Solve for x
    x = 265,961,456,467.33/665,639.64
  6. Step 6: Final answer
    x = 399,557.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.