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Finding the Fourth Proportional to 712.10, 1,068.78 and 365.67

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Solution

The fourth proportional to 712.10, 1,068.78 and 365.67 is: 548.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.10 : 1,068.78 = 365.67 : x
  2. Step 2: Convert to fraction form
    712.10/1,068.78 = 365.67/x
  3. Step 3: Cross multiply
    712.10x = 1,068.78 × 365.67
  4. Step 4: Simplify right side
    712.10x = 390,820.78
  5. Step 5: Solve for x
    x = 390,820.78/712.10
  6. Step 6: Final answer
    x = 548.83

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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.