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Finding the Fourth Proportional to 1,671.90, 2,507.40 and 697.80

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Solution

The fourth proportional to 1,671.90, 2,507.40 and 697.80 is: 1,046.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,671.90 : 2,507.40 = 697.80 : x
  2. Step 2: Convert to fraction form
    1,671.90/2,507.40 = 697.80/x
  3. Step 3: Cross multiply
    1,671.90x = 2,507.40 × 697.80
  4. Step 4: Simplify right side
    1,671.90x = 1,749,663.72
  5. Step 5: Solve for x
    x = 1,749,663.72/1,671.90
  6. Step 6: Final answer
    x = 1,046.51

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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.