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Finding the Fourth Proportional to 556.45, 767.99 and 390.91

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Solution

The fourth proportional to 556.45, 767.99 and 390.91 is: 539.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.45 : 767.99 = 390.91 : x
  2. Step 2: Convert to fraction form
    556.45/767.99 = 390.91/x
  3. Step 3: Cross multiply
    556.45x = 767.99 × 390.91
  4. Step 4: Simplify right side
    556.45x = 300,214.97
  5. Step 5: Solve for x
    x = 300,214.97/556.45
  6. Step 6: Final answer
    x = 539.52

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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.