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Finding the Fourth Proportional to 767.55, 1,058.89 and 518.78

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Solution

The fourth proportional to 767.55, 1,058.89 and 518.78 is: 715.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.55 : 1,058.89 = 518.78 : x
  2. Step 2: Convert to fraction form
    767.55/1,058.89 = 518.78/x
  3. Step 3: Cross multiply
    767.55x = 1,058.89 × 518.78
  4. Step 4: Simplify right side
    767.55x = 549,330.95
  5. Step 5: Solve for x
    x = 549,330.95/767.55
  6. Step 6: Final answer
    x = 715.69

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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.