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Finding the Fourth Proportional to 767.39, 1,058.54 and 557.28

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Solution

The fourth proportional to 767.39, 1,058.54 and 557.28 is: 768.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.39 : 1,058.54 = 557.28 : x
  2. Step 2: Convert to fraction form
    767.39/1,058.54 = 557.28/x
  3. Step 3: Cross multiply
    767.39x = 1,058.54 × 557.28
  4. Step 4: Simplify right side
    767.39x = 589,900.38
  5. Step 5: Solve for x
    x = 589,900.38/767.39
  6. Step 6: Final answer
    x = 768.72

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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.