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Finding the Fourth Proportional to 1,644.40, 2,270.10 and 1,085.68

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Solution

The fourth proportional to 1,644.40, 2,270.10 and 1,085.68 is: 1,498.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,644.40 : 2,270.10 = 1,085.68 : x
  2. Step 2: Convert to fraction form
    1,644.40/2,270.10 = 1,085.68/x
  3. Step 3: Cross multiply
    1,644.40x = 2,270.10 × 1,085.68
  4. Step 4: Simplify right side
    1,644.40x = 2,464,602.17
  5. Step 5: Solve for x
    x = 2,464,602.17/1,644.40
  6. Step 6: Final answer
    x = 1,498.79

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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.