Home / 1,280.15-1,919.60-414.35

Finding the Fourth Proportional to 1,280.15, 1,919.60 and 414.35

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Solution

The fourth proportional to 1,280.15, 1,919.60 and 414.35 is: 621.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.15 : 1,919.60 = 414.35 : x
  2. Step 2: Convert to fraction form
    1,280.15/1,919.60 = 414.35/x
  3. Step 3: Cross multiply
    1,280.15x = 1,919.60 × 414.35
  4. Step 4: Simplify right side
    1,280.15x = 795,384.19
  5. Step 5: Solve for x
    x = 795,384.19/1,280.15
  6. Step 6: Final answer
    x = 621.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.