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Finding the Fourth Proportional to 1,164.67, 1,607.28 and 640.72

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Solution

The fourth proportional to 1,164.67, 1,607.28 and 640.72 is: 884.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,164.67 : 1,607.28 = 640.72 : x
  2. Step 2: Convert to fraction form
    1,164.67/1,607.28 = 640.72/x
  3. Step 3: Cross multiply
    1,164.67x = 1,607.28 × 640.72
  4. Step 4: Simplify right side
    1,164.67x = 1,029,816.44
  5. Step 5: Solve for x
    x = 1,029,816.44/1,164.67
  6. Step 6: Final answer
    x = 884.21

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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.