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Finding the Fourth Proportional to 543.86, 813.72 and 390.14

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Solution

The fourth proportional to 543.86, 813.72 and 390.14 is: 583.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.86 : 813.72 = 390.14 : x
  2. Step 2: Convert to fraction form
    543.86/813.72 = 390.14/x
  3. Step 3: Cross multiply
    543.86x = 813.72 × 390.14
  4. Step 4: Simplify right side
    543.86x = 317,464.72
  5. Step 5: Solve for x
    x = 317,464.72/543.86
  6. Step 6: Final answer
    x = 583.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.