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Finding the Fourth Proportional to 640,318.77, 883,642.64 and 349,936.11

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Solution

The fourth proportional to 640,318.77, 883,642.64 and 349,936.11 is: 482,913.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,318.77 : 883,642.64 = 349,936.11 : x
  2. Step 2: Convert to fraction form
    640,318.77/883,642.64 = 349,936.11/x
  3. Step 3: Cross multiply
    640,318.77x = 883,642.64 × 349,936.11
  4. Step 4: Simplify right side
    640,318.77x = 309,218,466,322.05
  5. Step 5: Solve for x
    x = 309,218,466,322.05/640,318.77
  6. Step 6: Final answer
    x = 482,913.33

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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.