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Finding the Fourth Proportional to 556.21, 767 and 390.37

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Solution

The fourth proportional to 556.21, 767 and 390.37 is: 538.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.21 : 767 = 390.37 : x
  2. Step 2: Convert to fraction form
    556.21/767 = 390.37/x
  3. Step 3: Cross multiply
    556.21x = 767 × 390.37
  4. Step 4: Simplify right side
    556.21x = 299,413.79
  5. Step 5: Solve for x
    x = 299,413.79/556.21
  6. Step 6: Final answer
    x = 538.31

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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.