Home / 1,280.69-1,917.38-841.46

Finding the Fourth Proportional to 1,280.69, 1,917.38 and 841.46

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Solution

The fourth proportional to 1,280.69, 1,917.38 and 841.46 is: 1,259.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.69 : 1,917.38 = 841.46 : x
  2. Step 2: Convert to fraction form
    1,280.69/1,917.38 = 841.46/x
  3. Step 3: Cross multiply
    1,280.69x = 1,917.38 × 841.46
  4. Step 4: Simplify right side
    1,280.69x = 1,613,405.47
  5. Step 5: Solve for x
    x = 1,613,405.47/1,280.69
  6. Step 6: Final answer
    x = 1,259.80

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1.5x scale

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.