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Finding the Fourth Proportional to 872.16, 1,307.42 and 294.63

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Solution

The fourth proportional to 872.16, 1,307.42 and 294.63 is: 441.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.16 : 1,307.42 = 294.63 : x
  2. Step 2: Convert to fraction form
    872.16/1,307.42 = 294.63/x
  3. Step 3: Cross multiply
    872.16x = 1,307.42 × 294.63
  4. Step 4: Simplify right side
    872.16x = 385,205.15
  5. Step 5: Solve for x
    x = 385,205.15/872.16
  6. Step 6: Final answer
    x = 441.67

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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.