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Finding the Fourth Proportional to 1,133.12, 1,695.10 and 980.75

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Solution

The fourth proportional to 1,133.12, 1,695.10 and 980.75 is: 1,467.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,133.12 : 1,695.10 = 980.75 : x
  2. Step 2: Convert to fraction form
    1,133.12/1,695.10 = 980.75/x
  3. Step 3: Cross multiply
    1,133.12x = 1,695.10 × 980.75
  4. Step 4: Simplify right side
    1,133.12x = 1,662,469.33
  5. Step 5: Solve for x
    x = 1,662,469.33/1,133.12
  6. Step 6: Final answer
    x = 1,467.16

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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.