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Finding the Fourth Proportional to 768.31, 1,058.60 and 519.19

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Solution

The fourth proportional to 768.31, 1,058.60 and 519.19 is: 715.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.31 : 1,058.60 = 519.19 : x
  2. Step 2: Convert to fraction form
    768.31/1,058.60 = 519.19/x
  3. Step 3: Cross multiply
    768.31x = 1,058.60 × 519.19
  4. Step 4: Simplify right side
    768.31x = 549,613.19
  5. Step 5: Solve for x
    x = 549,613.19/768.31
  6. Step 6: Final answer
    x = 715.36

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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.