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Finding the Fourth Proportional to 647.82, 972.20 and 485.94

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Solution

The fourth proportional to 647.82, 972.20 and 485.94 is: 729.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.82 : 972.20 = 485.94 : x
  2. Step 2: Convert to fraction form
    647.82/972.20 = 485.94/x
  3. Step 3: Cross multiply
    647.82x = 972.20 × 485.94
  4. Step 4: Simplify right side
    647.82x = 472,430.87
  5. Step 5: Solve for x
    x = 472,430.87/647.82
  6. Step 6: Final answer
    x = 729.26

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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.