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Finding the Fourth Proportional to 543.60, 749.30 and 445.20

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Solution

The fourth proportional to 543.60, 749.30 and 445.20 is: 613.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.60 : 749.30 = 445.20 : x
  2. Step 2: Convert to fraction form
    543.60/749.30 = 445.20/x
  3. Step 3: Cross multiply
    543.60x = 749.30 × 445.20
  4. Step 4: Simplify right side
    543.60x = 333,588.36
  5. Step 5: Solve for x
    x = 333,588.36/543.60
  6. Step 6: Final answer
    x = 613.67

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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.