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Finding the Fourth Proportional to 678.64, 1,018.08 and 191.76

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Solution

The fourth proportional to 678.64, 1,018.08 and 191.76 is: 287.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.64 : 1,018.08 = 191.76 : x
  2. Step 2: Convert to fraction form
    678.64/1,018.08 = 191.76/x
  3. Step 3: Cross multiply
    678.64x = 1,018.08 × 191.76
  4. Step 4: Simplify right side
    678.64x = 195,227.02
  5. Step 5: Solve for x
    x = 195,227.02/678.64
  6. Step 6: Final answer
    x = 287.67

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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.