Home / 1,145.36-1,580.60-621.39

Finding the Fourth Proportional to 1,145.36, 1,580.60 and 621.39

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Solution

The fourth proportional to 1,145.36, 1,580.60 and 621.39 is: 857.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.36 : 1,580.60 = 621.39 : x
  2. Step 2: Convert to fraction form
    1,145.36/1,580.60 = 621.39/x
  3. Step 3: Cross multiply
    1,145.36x = 1,580.60 × 621.39
  4. Step 4: Simplify right side
    1,145.36x = 982,169.03
  5. Step 5: Solve for x
    x = 982,169.03/1,145.36
  6. Step 6: Final answer
    x = 857.52

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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.