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Finding the Fourth Proportional to 891.42, 1,230.38 and 559.67

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Solution

The fourth proportional to 891.42, 1,230.38 and 559.67 is: 772.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.42 : 1,230.38 = 559.67 : x
  2. Step 2: Convert to fraction form
    891.42/1,230.38 = 559.67/x
  3. Step 3: Cross multiply
    891.42x = 1,230.38 × 559.67
  4. Step 4: Simplify right side
    891.42x = 688,597.82
  5. Step 5: Solve for x
    x = 688,597.82/891.42
  6. Step 6: Final answer
    x = 772.47

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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.