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Finding the Fourth Proportional to 1,145.22, 1,580.42 and 621.26

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Solution

The fourth proportional to 1,145.22, 1,580.42 and 621.26 is: 857.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.22 : 1,580.42 = 621.26 : x
  2. Step 2: Convert to fraction form
    1,145.22/1,580.42 = 621.26/x
  3. Step 3: Cross multiply
    1,145.22x = 1,580.42 × 621.26
  4. Step 4: Simplify right side
    1,145.22x = 981,840.72
  5. Step 5: Solve for x
    x = 981,840.72/1,145.22
  6. Step 6: Final answer
    x = 857.34

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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.