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Finding the Fourth Proportional to 543.30, 749.81 and 403.59

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Solution

The fourth proportional to 543.30, 749.81 and 403.59 is: 556.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.30 : 749.81 = 403.59 : x
  2. Step 2: Convert to fraction form
    543.30/749.81 = 403.59/x
  3. Step 3: Cross multiply
    543.30x = 749.81 × 403.59
  4. Step 4: Simplify right side
    543.30x = 302,613.80
  5. Step 5: Solve for x
    x = 302,613.80/543.30
  6. Step 6: Final answer
    x = 556.99

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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.