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Finding the Fourth Proportional to 2,085.63, 3,129.66 and 990.51

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Solution

The fourth proportional to 2,085.63, 3,129.66 and 990.51 is: 1,486.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.63 : 3,129.66 = 990.51 : x
  2. Step 2: Convert to fraction form
    2,085.63/3,129.66 = 990.51/x
  3. Step 3: Cross multiply
    2,085.63x = 3,129.66 × 990.51
  4. Step 4: Simplify right side
    2,085.63x = 3,099,959.53
  5. Step 5: Solve for x
    x = 3,099,959.53/2,085.63
  6. Step 6: Final answer
    x = 1,486.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.