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Finding the Fourth Proportional to 1,489.74, 2,055.69 and 851.69

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Solution

The fourth proportional to 1,489.74, 2,055.69 and 851.69 is: 1,175.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.74 : 2,055.69 = 851.69 : x
  2. Step 2: Convert to fraction form
    1,489.74/2,055.69 = 851.69/x
  3. Step 3: Cross multiply
    1,489.74x = 2,055.69 × 851.69
  4. Step 4: Simplify right side
    1,489.74x = 1,750,810.62
  5. Step 5: Solve for x
    x = 1,750,810.62/1,489.74
  6. Step 6: Final answer
    x = 1,175.25

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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.