Home / 1,585.81-2,187.12-1,212.20

Finding the Fourth Proportional to 1,585.81, 2,187.12 and 1,212.20

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Solution

The fourth proportional to 1,585.81, 2,187.12 and 1,212.20 is: 1,671.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.81 : 2,187.12 = 1,212.20 : x
  2. Step 2: Convert to fraction form
    1,585.81/2,187.12 = 1,212.20/x
  3. Step 3: Cross multiply
    1,585.81x = 2,187.12 × 1,212.20
  4. Step 4: Simplify right side
    1,585.81x = 2,651,215.93
  5. Step 5: Solve for x
    x = 2,651,215.93/1,585.81
  6. Step 6: Final answer
    x = 1,671.84

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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.