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Finding the Fourth Proportional to 1,489.86, 2,054.57 and 992.52

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Solution

The fourth proportional to 1,489.86, 2,054.57 and 992.52 is: 1,368.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.86 : 2,054.57 = 992.52 : x
  2. Step 2: Convert to fraction form
    1,489.86/2,054.57 = 992.52/x
  3. Step 3: Cross multiply
    1,489.86x = 2,054.57 × 992.52
  4. Step 4: Simplify right side
    1,489.86x = 2,039,196.85
  5. Step 5: Solve for x
    x = 2,039,196.85/1,489.86
  6. Step 6: Final answer
    x = 1,368.72

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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.