Home / 1,440.26-1,985.55-1,218.32

Finding the Fourth Proportional to 1,440.26, 1,985.55 and 1,218.32

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Solution

The fourth proportional to 1,440.26, 1,985.55 and 1,218.32 is: 1,679.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.26 : 1,985.55 = 1,218.32 : x
  2. Step 2: Convert to fraction form
    1,440.26/1,985.55 = 1,218.32/x
  3. Step 3: Cross multiply
    1,440.26x = 1,985.55 × 1,218.32
  4. Step 4: Simplify right side
    1,440.26x = 2,419,035.28
  5. Step 5: Solve for x
    x = 2,419,035.28/1,440.26
  6. Step 6: Final answer
    x = 1,679.58

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Double scale
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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.