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Finding the Fourth Proportional to 1,489.74, 2,055.39 and 860.19

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Solution

The fourth proportional to 1,489.74, 2,055.39 and 860.19 is: 1,186.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.74 : 2,055.39 = 860.19 : x
  2. Step 2: Convert to fraction form
    1,489.74/2,055.39 = 860.19/x
  3. Step 3: Cross multiply
    1,489.74x = 2,055.39 × 860.19
  4. Step 4: Simplify right side
    1,489.74x = 1,768,025.92
  5. Step 5: Solve for x
    x = 1,768,025.92/1,489.74
  6. Step 6: Final answer
    x = 1,186.80

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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.