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Finding the Fourth Proportional to 479.93, 715.33 and 431.33

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Solution

The fourth proportional to 479.93, 715.33 and 431.33 is: 642.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.93 : 715.33 = 431.33 : x
  2. Step 2: Convert to fraction form
    479.93/715.33 = 431.33/x
  3. Step 3: Cross multiply
    479.93x = 715.33 × 431.33
  4. Step 4: Simplify right side
    479.93x = 308,540.25
  5. Step 5: Solve for x
    x = 308,540.25/479.93
  6. Step 6: Final answer
    x = 642.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.