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Finding the Fourth Proportional to 543.45, 749.91 and 307.41

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Solution

The fourth proportional to 543.45, 749.91 and 307.41 is: 424.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.45 : 749.91 = 307.41 : x
  2. Step 2: Convert to fraction form
    543.45/749.91 = 307.41/x
  3. Step 3: Cross multiply
    543.45x = 749.91 × 307.41
  4. Step 4: Simplify right side
    543.45x = 230,529.83
  5. Step 5: Solve for x
    x = 230,529.83/543.45
  6. Step 6: Final answer
    x = 424.20

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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.