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Finding the Fourth Proportional to 1,280.17, 1,768.52 and 860.39

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Solution

The fourth proportional to 1,280.17, 1,768.52 and 860.39 is: 1,188.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.17 : 1,768.52 = 860.39 : x
  2. Step 2: Convert to fraction form
    1,280.17/1,768.52 = 860.39/x
  3. Step 3: Cross multiply
    1,280.17x = 1,768.52 × 860.39
  4. Step 4: Simplify right side
    1,280.17x = 1,521,616.92
  5. Step 5: Solve for x
    x = 1,521,616.92/1,280.17
  6. Step 6: Final answer
    x = 1,188.61

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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.