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Finding the Fourth Proportional to 1,289.93, 1,779.75 and 817.59

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Solution

The fourth proportional to 1,289.93, 1,779.75 and 817.59 is: 1,128.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.93 : 1,779.75 = 817.59 : x
  2. Step 2: Convert to fraction form
    1,289.93/1,779.75 = 817.59/x
  3. Step 3: Cross multiply
    1,289.93x = 1,779.75 × 817.59
  4. Step 4: Simplify right side
    1,289.93x = 1,455,105.80
  5. Step 5: Solve for x
    x = 1,455,105.80/1,289.93
  6. Step 6: Final answer
    x = 1,128.05

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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.