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Finding the Fourth Proportional to 903.35, 1,240.31 and 889.58

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Solution

The fourth proportional to 903.35, 1,240.31 and 889.58 is: 1,221.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.35 : 1,240.31 = 889.58 : x
  2. Step 2: Convert to fraction form
    903.35/1,240.31 = 889.58/x
  3. Step 3: Cross multiply
    903.35x = 1,240.31 × 889.58
  4. Step 4: Simplify right side
    903.35x = 1,103,360.29
  5. Step 5: Solve for x
    x = 1,103,360.29/903.35
  6. Step 6: Final answer
    x = 1,221.41

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Double scale
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1.5x scale

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.