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Finding the Fourth Proportional to 571.69, 860.65 and 390.23

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Solution

The fourth proportional to 571.69, 860.65 and 390.23 is: 587.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.69 : 860.65 = 390.23 : x
  2. Step 2: Convert to fraction form
    571.69/860.65 = 390.23/x
  3. Step 3: Cross multiply
    571.69x = 860.65 × 390.23
  4. Step 4: Simplify right side
    571.69x = 335,851.45
  5. Step 5: Solve for x
    x = 335,851.45/571.69
  6. Step 6: Final answer
    x = 587.47

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.