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Finding the Fourth Proportional to 1,489.54, 2,055.61 and 817.38

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Solution

The fourth proportional to 1,489.54, 2,055.61 and 817.38 is: 1,128.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.54 : 2,055.61 = 817.38 : x
  2. Step 2: Convert to fraction form
    1,489.54/2,055.61 = 817.38/x
  3. Step 3: Cross multiply
    1,489.54x = 2,055.61 × 817.38
  4. Step 4: Simplify right side
    1,489.54x = 1,680,214.50
  5. Step 5: Solve for x
    x = 1,680,214.50/1,489.54
  6. Step 6: Final answer
    x = 1,128.01

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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.