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Finding the Fourth Proportional to 889.51, 1,226.99 and 640.94

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Solution

The fourth proportional to 889.51, 1,226.99 and 640.94 is: 884.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.51 : 1,226.99 = 640.94 : x
  2. Step 2: Convert to fraction form
    889.51/1,226.99 = 640.94/x
  3. Step 3: Cross multiply
    889.51x = 1,226.99 × 640.94
  4. Step 4: Simplify right side
    889.51x = 786,423.77
  5. Step 5: Solve for x
    x = 786,423.77/889.51
  6. Step 6: Final answer
    x = 884.11

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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.