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Finding the Fourth Proportional to 687.41, 948.66 and 539.78

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Solution

The fourth proportional to 687.41, 948.66 and 539.78 is: 744.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.41 : 948.66 = 539.78 : x
  2. Step 2: Convert to fraction form
    687.41/948.66 = 539.78/x
  3. Step 3: Cross multiply
    687.41x = 948.66 × 539.78
  4. Step 4: Simplify right side
    687.41x = 512,070.07
  5. Step 5: Solve for x
    x = 512,070.07/687.41
  6. Step 6: Final answer
    x = 744.93

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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.