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Finding the Fourth Proportional to 1,107.65, 1,520.40 and 980.54

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Solution

The fourth proportional to 1,107.65, 1,520.40 and 980.54 is: 1,345.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.65 : 1,520.40 = 980.54 : x
  2. Step 2: Convert to fraction form
    1,107.65/1,520.40 = 980.54/x
  3. Step 3: Cross multiply
    1,107.65x = 1,520.40 × 980.54
  4. Step 4: Simplify right side
    1,107.65x = 1,490,813.02
  5. Step 5: Solve for x
    x = 1,490,813.02/1,107.65
  6. Step 6: Final answer
    x = 1,345.92

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.