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Finding the Fourth Proportional to 887.87, 1,225.66 and 640.42

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Solution

The fourth proportional to 887.87, 1,225.66 and 640.42 is: 884.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.87 : 1,225.66 = 640.42 : x
  2. Step 2: Convert to fraction form
    887.87/1,225.66 = 640.42/x
  3. Step 3: Cross multiply
    887.87x = 1,225.66 × 640.42
  4. Step 4: Simplify right side
    887.87x = 784,937.18
  5. Step 5: Solve for x
    x = 784,937.18/887.87
  6. Step 6: Final answer
    x = 884.07

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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.