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Finding the Fourth Proportional to 786.62, 1,178.34 and 493.16

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Solution

The fourth proportional to 786.62, 1,178.34 and 493.16 is: 738.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.62 : 1,178.34 = 493.16 : x
  2. Step 2: Convert to fraction form
    786.62/1,178.34 = 493.16/x
  3. Step 3: Cross multiply
    786.62x = 1,178.34 × 493.16
  4. Step 4: Simplify right side
    786.62x = 581,110.15
  5. Step 5: Solve for x
    x = 581,110.15/786.62
  6. Step 6: Final answer
    x = 738.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.