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Finding the Fourth Proportional to 1,379.79, 2,070.50 and 989.37

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Solution

The fourth proportional to 1,379.79, 2,070.50 and 989.37 is: 1,484.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.79 : 2,070.50 = 989.37 : x
  2. Step 2: Convert to fraction form
    1,379.79/2,070.50 = 989.37/x
  3. Step 3: Cross multiply
    1,379.79x = 2,070.50 × 989.37
  4. Step 4: Simplify right side
    1,379.79x = 2,048,485.64
  5. Step 5: Solve for x
    x = 2,048,485.64/1,379.79
  6. Step 6: Final answer
    x = 1,484.64

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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.