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Finding the Fourth Proportional to 549.40, 758.21 and 328.47

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Solution

The fourth proportional to 549.40, 758.21 and 328.47 is: 453.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.40 : 758.21 = 328.47 : x
  2. Step 2: Convert to fraction form
    549.40/758.21 = 328.47/x
  3. Step 3: Cross multiply
    549.40x = 758.21 × 328.47
  4. Step 4: Simplify right side
    549.40x = 249,051.96
  5. Step 5: Solve for x
    x = 249,051.96/549.40
  6. Step 6: Final answer
    x = 453.32

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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.