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Finding the Fourth Proportional to 1,276.34, 1,911.63 and 698.18

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Solution

The fourth proportional to 1,276.34, 1,911.63 and 698.18 is: 1,045.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.34 : 1,911.63 = 698.18 : x
  2. Step 2: Convert to fraction form
    1,276.34/1,911.63 = 698.18/x
  3. Step 3: Cross multiply
    1,276.34x = 1,911.63 × 698.18
  4. Step 4: Simplify right side
    1,276.34x = 1,334,661.83
  5. Step 5: Solve for x
    x = 1,334,661.83/1,276.34
  6. Step 6: Final answer
    x = 1,045.69

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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.