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Finding the Fourth Proportional to 1,208,936.79, 1,668,266.85 and 664,984.77

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Solution

The fourth proportional to 1,208,936.79, 1,668,266.85 and 664,984.77 is: 917,642.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208,936.79 : 1,668,266.85 = 664,984.77 : x
  2. Step 2: Convert to fraction form
    1,208,936.79/1,668,266.85 = 664,984.77/x
  3. Step 3: Cross multiply
    1,208,936.79x = 1,668,266.85 × 664,984.77
  4. Step 4: Simplify right side
    1,208,936.79x = 1,109,372,047,545.87
  5. Step 5: Solve for x
    x = 1,109,372,047,545.87/1,208,936.79
  6. Step 6: Final answer
    x = 917,642.72

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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.