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Finding the Fourth Proportional to 647.06, 893.86 and 515.90

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Solution

The fourth proportional to 647.06, 893.86 and 515.90 is: 712.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.06 : 893.86 = 515.90 : x
  2. Step 2: Convert to fraction form
    647.06/893.86 = 515.90/x
  3. Step 3: Cross multiply
    647.06x = 893.86 × 515.90
  4. Step 4: Simplify right side
    647.06x = 461,142.37
  5. Step 5: Solve for x
    x = 461,142.37/647.06
  6. Step 6: Final answer
    x = 712.67

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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.