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Finding the Fourth Proportional to 1,225.76, 1,838.66 and 445.77

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Solution

The fourth proportional to 1,225.76, 1,838.66 and 445.77 is: 668.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.76 : 1,838.66 = 445.77 : x
  2. Step 2: Convert to fraction form
    1,225.76/1,838.66 = 445.77/x
  3. Step 3: Cross multiply
    1,225.76x = 1,838.66 × 445.77
  4. Step 4: Simplify right side
    1,225.76x = 819,617.24
  5. Step 5: Solve for x
    x = 819,617.24/1,225.76
  6. Step 6: Final answer
    x = 668.66

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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.