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Finding the Fourth Proportional to 549.36, 823.12 and 386.70

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Solution

The fourth proportional to 549.36, 823.12 and 386.70 is: 579.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.36 : 823.12 = 386.70 : x
  2. Step 2: Convert to fraction form
    549.36/823.12 = 386.70/x
  3. Step 3: Cross multiply
    549.36x = 823.12 × 386.70
  4. Step 4: Simplify right side
    549.36x = 318,303.26
  5. Step 5: Solve for x
    x = 318,303.26/549.36
  6. Step 6: Final answer
    x = 579.41

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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.