Home / 1,280.61-1,768.12-981.33

Finding the Fourth Proportional to 1,280.61, 1,768.12 and 981.33

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Solution

The fourth proportional to 1,280.61, 1,768.12 and 981.33 is: 1,354.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.61 : 1,768.12 = 981.33 : x
  2. Step 2: Convert to fraction form
    1,280.61/1,768.12 = 981.33/x
  3. Step 3: Cross multiply
    1,280.61x = 1,768.12 × 981.33
  4. Step 4: Simplify right side
    1,280.61x = 1,735,106.75
  5. Step 5: Solve for x
    x = 1,735,106.75/1,280.61
  6. Step 6: Final answer
    x = 1,354.90

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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.