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Finding the Fourth Proportional to 543.72, 815.72 and 312.75

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Solution

The fourth proportional to 543.72, 815.72 and 312.75 is: 469.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.72 : 815.72 = 312.75 : x
  2. Step 2: Convert to fraction form
    543.72/815.72 = 312.75/x
  3. Step 3: Cross multiply
    543.72x = 815.72 × 312.75
  4. Step 4: Simplify right side
    543.72x = 255,114.87
  5. Step 5: Solve for x
    x = 255,114.87/543.72
  6. Step 6: Final answer
    x = 469.20

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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.