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Finding the Fourth Proportional to 1,225.55, 1,838.84 and 640.99

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Solution

The fourth proportional to 1,225.55, 1,838.84 and 640.99 is: 961.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.55 : 1,838.84 = 640.99 : x
  2. Step 2: Convert to fraction form
    1,225.55/1,838.84 = 640.99/x
  3. Step 3: Cross multiply
    1,225.55x = 1,838.84 × 640.99
  4. Step 4: Simplify right side
    1,225.55x = 1,178,678.05
  5. Step 5: Solve for x
    x = 1,178,678.05/1,225.55
  6. Step 6: Final answer
    x = 961.75

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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.