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Finding the Fourth Proportional to 556.38, 767.78 and 307.68

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Solution

The fourth proportional to 556.38, 767.78 and 307.68 is: 424.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.38 : 767.78 = 307.68 : x
  2. Step 2: Convert to fraction form
    556.38/767.78 = 307.68/x
  3. Step 3: Cross multiply
    556.38x = 767.78 × 307.68
  4. Step 4: Simplify right side
    556.38x = 236,230.55
  5. Step 5: Solve for x
    x = 236,230.55/556.38
  6. Step 6: Final answer
    x = 424.58

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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.