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Finding the Fourth Proportional to 613.94, 920.93 and 431.69

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Solution

The fourth proportional to 613.94, 920.93 and 431.69 is: 647.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.94 : 920.93 = 431.69 : x
  2. Step 2: Convert to fraction form
    613.94/920.93 = 431.69/x
  3. Step 3: Cross multiply
    613.94x = 920.93 × 431.69
  4. Step 4: Simplify right side
    613.94x = 397,549.51
  5. Step 5: Solve for x
    x = 397,549.51/613.94
  6. Step 6: Final answer
    x = 647.54

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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.