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Finding the Fourth Proportional to 1,215, 1,823.40 and 445.56

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Solution

The fourth proportional to 1,215, 1,823.40 and 445.56 is: 668.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215 : 1,823.40 = 445.56 : x
  2. Step 2: Convert to fraction form
    1,215/1,823.40 = 445.56/x
  3. Step 3: Cross multiply
    1,215x = 1,823.40 × 445.56
  4. Step 4: Simplify right side
    1,215x = 812,434.10
  5. Step 5: Solve for x
    x = 812,434.10/1,215
  6. Step 6: Final answer
    x = 668.67

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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.