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Finding the Fourth Proportional to 979.98, 1,349.91 and 917.34

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Solution

The fourth proportional to 979.98, 1,349.91 and 917.34 is: 1,263.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.98 : 1,349.91 = 917.34 : x
  2. Step 2: Convert to fraction form
    979.98/1,349.91 = 917.34/x
  3. Step 3: Cross multiply
    979.98x = 1,349.91 × 917.34
  4. Step 4: Simplify right side
    979.98x = 1,238,326.44
  5. Step 5: Solve for x
    x = 1,238,326.44/979.98
  6. Step 6: Final answer
    x = 1,263.62

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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.