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Finding the Fourth Proportional to 647.70, 893.79 and 423.69

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Solution

The fourth proportional to 647.70, 893.79 and 423.69 is: 584.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.70 : 893.79 = 423.69 : x
  2. Step 2: Convert to fraction form
    647.70/893.79 = 423.69/x
  3. Step 3: Cross multiply
    647.70x = 893.79 × 423.69
  4. Step 4: Simplify right side
    647.70x = 378,689.89
  5. Step 5: Solve for x
    x = 378,689.89/647.70
  6. Step 6: Final answer
    x = 584.67

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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.