Home / 1,145.51-1,580.80-621.54

Finding the Fourth Proportional to 1,145.51, 1,580.80 and 621.54

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Solution

The fourth proportional to 1,145.51, 1,580.80 and 621.54 is: 857.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.51 : 1,580.80 = 621.54 : x
  2. Step 2: Convert to fraction form
    1,145.51/1,580.80 = 621.54/x
  3. Step 3: Cross multiply
    1,145.51x = 1,580.80 × 621.54
  4. Step 4: Simplify right side
    1,145.51x = 982,528.88
  5. Step 5: Solve for x
    x = 982,528.88/1,145.51
  6. Step 6: Final answer
    x = 857.73

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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.