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Finding the Fourth Proportional to 1,281.48, 1,920.36 and 695.99

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Solution

The fourth proportional to 1,281.48, 1,920.36 and 695.99 is: 1,042.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.48 : 1,920.36 = 695.99 : x
  2. Step 2: Convert to fraction form
    1,281.48/1,920.36 = 695.99/x
  3. Step 3: Cross multiply
    1,281.48x = 1,920.36 × 695.99
  4. Step 4: Simplify right side
    1,281.48x = 1,336,541.75
  5. Step 5: Solve for x
    x = 1,336,541.75/1,281.48
  6. Step 6: Final answer
    x = 1,042.97

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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.