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Finding the Fourth Proportional to 1,289.38, 1,779.77 and 917.44

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Solution

The fourth proportional to 1,289.38, 1,779.77 and 917.44 is: 1,266.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.38 : 1,779.77 = 917.44 : x
  2. Step 2: Convert to fraction form
    1,289.38/1,779.77 = 917.44/x
  3. Step 3: Cross multiply
    1,289.38x = 1,779.77 × 917.44
  4. Step 4: Simplify right side
    1,289.38x = 1,632,832.19
  5. Step 5: Solve for x
    x = 1,632,832.19/1,289.38
  6. Step 6: Final answer
    x = 1,266.37

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1.5x scale

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.