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Finding the Fourth Proportional to 647.72, 973.20 and 416.72

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Solution

The fourth proportional to 647.72, 973.20 and 416.72 is: 626.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.72 : 973.20 = 416.72 : x
  2. Step 2: Convert to fraction form
    647.72/973.20 = 416.72/x
  3. Step 3: Cross multiply
    647.72x = 973.20 × 416.72
  4. Step 4: Simplify right side
    647.72x = 405,551.90
  5. Step 5: Solve for x
    x = 405,551.90/647.72
  6. Step 6: Final answer
    x = 626.12

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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.