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Finding the Fourth Proportional to 767.56, 1,058.80 and 487.28

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Solution

The fourth proportional to 767.56, 1,058.80 and 487.28 is: 672.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.56 : 1,058.80 = 487.28 : x
  2. Step 2: Convert to fraction form
    767.56/1,058.80 = 487.28/x
  3. Step 3: Cross multiply
    767.56x = 1,058.80 × 487.28
  4. Step 4: Simplify right side
    767.56x = 515,932.06
  5. Step 5: Solve for x
    x = 515,932.06/767.56
  6. Step 6: Final answer
    x = 672.17

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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.