Home / 1,586.39-2,190.29-989.12

Finding the Fourth Proportional to 1,586.39, 2,190.29 and 989.12

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Solution

The fourth proportional to 1,586.39, 2,190.29 and 989.12 is: 1,365.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,586.39 : 2,190.29 = 989.12 : x
  2. Step 2: Convert to fraction form
    1,586.39/2,190.29 = 989.12/x
  3. Step 3: Cross multiply
    1,586.39x = 2,190.29 × 989.12
  4. Step 4: Simplify right side
    1,586.39x = 2,166,459.64
  5. Step 5: Solve for x
    x = 2,166,459.64/1,586.39
  6. Step 6: Final answer
    x = 1,365.65

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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.