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Finding the Fourth Proportional to 1,864.53, 2,790.74 and 985.79

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Solution

The fourth proportional to 1,864.53, 2,790.74 and 985.79 is: 1,475.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,864.53 : 2,790.74 = 985.79 : x
  2. Step 2: Convert to fraction form
    1,864.53/2,790.74 = 985.79/x
  3. Step 3: Cross multiply
    1,864.53x = 2,790.74 × 985.79
  4. Step 4: Simplify right side
    1,864.53x = 2,751,064.70
  5. Step 5: Solve for x
    x = 2,751,064.70/1,864.53
  6. Step 6: Final answer
    x = 1,475.47

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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.