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Finding the Fourth Proportional to 1,280.14, 1,920.35 and 695.72

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Solution

The fourth proportional to 1,280.14, 1,920.35 and 695.72 is: 1,043.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.14 : 1,920.35 = 695.72 : x
  2. Step 2: Convert to fraction form
    1,280.14/1,920.35 = 695.72/x
  3. Step 3: Cross multiply
    1,280.14x = 1,920.35 × 695.72
  4. Step 4: Simplify right side
    1,280.14x = 1,336,032.44
  5. Step 5: Solve for x
    x = 1,336,032.44/1,280.14
  6. Step 6: Final answer
    x = 1,043.66

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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.