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Finding the Fourth Proportional to 1,671.20, 2,507.70 and 697.40

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Solution

The fourth proportional to 1,671.20, 2,507.70 and 697.40 is: 1,046.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,671.20 : 2,507.70 = 697.40 : x
  2. Step 2: Convert to fraction form
    1,671.20/2,507.70 = 697.40/x
  3. Step 3: Cross multiply
    1,671.20x = 2,507.70 × 697.40
  4. Step 4: Simplify right side
    1,671.20x = 1,748,869.98
  5. Step 5: Solve for x
    x = 1,748,869.98/1,671.20
  6. Step 6: Final answer
    x = 1,046.48

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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.