Home / 1,040.78-1,436.46-621.15

Finding the Fourth Proportional to 1,040.78, 1,436.46 and 621.15

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Solution

The fourth proportional to 1,040.78, 1,436.46 and 621.15 is: 857.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.78 : 1,436.46 = 621.15 : x
  2. Step 2: Convert to fraction form
    1,040.78/1,436.46 = 621.15/x
  3. Step 3: Cross multiply
    1,040.78x = 1,436.46 × 621.15
  4. Step 4: Simplify right side
    1,040.78x = 892,257.13
  5. Step 5: Solve for x
    x = 892,257.13/1,040.78
  6. Step 6: Final answer
    x = 857.30

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Double scale
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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.