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Finding the Fourth Proportional to 556.31, 767.70 and 307.64

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Solution

The fourth proportional to 556.31, 767.70 and 307.64 is: 424.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.31 : 767.70 = 307.64 : x
  2. Step 2: Convert to fraction form
    556.31/767.70 = 307.64/x
  3. Step 3: Cross multiply
    556.31x = 767.70 × 307.64
  4. Step 4: Simplify right side
    556.31x = 236,175.23
  5. Step 5: Solve for x
    x = 236,175.23/556.31
  6. Step 6: Final answer
    x = 424.54

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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.