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Finding the Fourth Proportional to 767.68, 1,059.28 and 518.60

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Solution

The fourth proportional to 767.68, 1,059.28 and 518.60 is: 715.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.68 : 1,059.28 = 518.60 : x
  2. Step 2: Convert to fraction form
    767.68/1,059.28 = 518.60/x
  3. Step 3: Cross multiply
    767.68x = 1,059.28 × 518.60
  4. Step 4: Simplify right side
    767.68x = 549,342.61
  5. Step 5: Solve for x
    x = 549,342.61/767.68
  6. Step 6: Final answer
    x = 715.59

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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.