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Finding the Fourth Proportional to 647.05, 891.36 and 480.98

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Solution

The fourth proportional to 647.05, 891.36 and 480.98 is: 662.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.05 : 891.36 = 480.98 : x
  2. Step 2: Convert to fraction form
    647.05/891.36 = 480.98/x
  3. Step 3: Cross multiply
    647.05x = 891.36 × 480.98
  4. Step 4: Simplify right side
    647.05x = 428,719.47
  5. Step 5: Solve for x
    x = 428,719.47/647.05
  6. Step 6: Final answer
    x = 662.58

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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.