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Finding the Fourth Proportional to 647.19, 890.61 and 628.20

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Solution

The fourth proportional to 647.19, 890.61 and 628.20 is: 864.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.19 : 890.61 = 628.20 : x
  2. Step 2: Convert to fraction form
    647.19/890.61 = 628.20/x
  3. Step 3: Cross multiply
    647.19x = 890.61 × 628.20
  4. Step 4: Simplify right side
    647.19x = 559,481.20
  5. Step 5: Solve for x
    x = 559,481.20/647.19
  6. Step 6: Final answer
    x = 864.48

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.