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Finding the Fourth Proportional to 1,208,936.79, 1,668,266.87 and 664,984.76

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Solution

The fourth proportional to 1,208,936.79, 1,668,266.87 and 664,984.76 is: 917,642.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208,936.79 : 1,668,266.87 = 664,984.76 : x
  2. Step 2: Convert to fraction form
    1,208,936.79/1,668,266.87 = 664,984.76/x
  3. Step 3: Cross multiply
    1,208,936.79x = 1,668,266.87 × 664,984.76
  4. Step 4: Simplify right side
    1,208,936.79x = 1,109,372,032,496.64
  5. Step 5: Solve for x
    x = 1,109,372,032,496.64/1,208,936.79
  6. Step 6: Final answer
    x = 917,642.71

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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.