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Finding the Fourth Proportional to 1,105.48, 1,525.26 and 685.63

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Solution

The fourth proportional to 1,105.48, 1,525.26 and 685.63 is: 945.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.48 : 1,525.26 = 685.63 : x
  2. Step 2: Convert to fraction form
    1,105.48/1,525.26 = 685.63/x
  3. Step 3: Cross multiply
    1,105.48x = 1,525.26 × 685.63
  4. Step 4: Simplify right side
    1,105.48x = 1,045,764.01
  5. Step 5: Solve for x
    x = 1,045,764.01/1,105.48
  6. Step 6: Final answer
    x = 945.98

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1.5x scale

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.