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Finding the Fourth Proportional to 543.21, 749.63 and 307.20

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Solution

The fourth proportional to 543.21, 749.63 and 307.20 is: 423.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.21 : 749.63 = 307.20 : x
  2. Step 2: Convert to fraction form
    543.21/749.63 = 307.20/x
  3. Step 3: Cross multiply
    543.21x = 749.63 × 307.20
  4. Step 4: Simplify right side
    543.21x = 230,287.10
  5. Step 5: Solve for x
    x = 230,287.10/543.21
  6. Step 6: Final answer
    x = 423.94

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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.