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Finding the Fourth Proportional to 979.70, 1,353.05 and 918.64

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Solution

The fourth proportional to 979.70, 1,353.05 and 918.64 is: 1,268.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.70 : 1,353.05 = 918.64 : x
  2. Step 2: Convert to fraction form
    979.70/1,353.05 = 918.64/x
  3. Step 3: Cross multiply
    979.70x = 1,353.05 × 918.64
  4. Step 4: Simplify right side
    979.70x = 1,242,971.56
  5. Step 5: Solve for x
    x = 1,242,971.56/979.70
  6. Step 6: Final answer
    x = 1,268.73

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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.