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Finding the Fourth Proportional to 1,298.70, 1,945.75 and 989.62

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Solution

The fourth proportional to 1,298.70, 1,945.75 and 989.62 is: 1,482.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.70 : 1,945.75 = 989.62 : x
  2. Step 2: Convert to fraction form
    1,298.70/1,945.75 = 989.62/x
  3. Step 3: Cross multiply
    1,298.70x = 1,945.75 × 989.62
  4. Step 4: Simplify right side
    1,298.70x = 1,925,544.85
  5. Step 5: Solve for x
    x = 1,925,544.85/1,298.70
  6. Step 6: Final answer
    x = 1,482.67

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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.