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Finding the Fourth Proportional to 1,945.08, 2,918.70 and 905.40

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Solution

The fourth proportional to 1,945.08, 2,918.70 and 905.40 is: 1,358.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,945.08 : 2,918.70 = 905.40 : x
  2. Step 2: Convert to fraction form
    1,945.08/2,918.70 = 905.40/x
  3. Step 3: Cross multiply
    1,945.08x = 2,918.70 × 905.40
  4. Step 4: Simplify right side
    1,945.08x = 2,642,590.98
  5. Step 5: Solve for x
    x = 2,642,590.98/1,945.08
  6. Step 6: Final answer
    x = 1,358.60

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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.