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Finding the Fourth Proportional to 767.47, 1,058.53 and 487.46

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Solution

The fourth proportional to 767.47, 1,058.53 and 487.46 is: 672.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.47 : 1,058.53 = 487.46 : x
  2. Step 2: Convert to fraction form
    767.47/1,058.53 = 487.46/x
  3. Step 3: Cross multiply
    767.47x = 1,058.53 × 487.46
  4. Step 4: Simplify right side
    767.47x = 515,988.60
  5. Step 5: Solve for x
    x = 515,988.60/767.47
  6. Step 6: Final answer
    x = 672.33

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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.