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Finding the Fourth Proportional to 2,160.86, 3,238.47 and 990.44

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Solution

The fourth proportional to 2,160.86, 3,238.47 and 990.44 is: 1,484.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,160.86 : 3,238.47 = 990.44 : x
  2. Step 2: Convert to fraction form
    2,160.86/3,238.47 = 990.44/x
  3. Step 3: Cross multiply
    2,160.86x = 3,238.47 × 990.44
  4. Step 4: Simplify right side
    2,160.86x = 3,207,510.23
  5. Step 5: Solve for x
    x = 3,207,510.23/2,160.86
  6. Step 6: Final answer
    x = 1,484.37

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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.