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Finding the Fourth Proportional to 1,327.58, 1,991.30 and 403.16

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Solution

The fourth proportional to 1,327.58, 1,991.30 and 403.16 is: 604.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.58 : 1,991.30 = 403.16 : x
  2. Step 2: Convert to fraction form
    1,327.58/1,991.30 = 403.16/x
  3. Step 3: Cross multiply
    1,327.58x = 1,991.30 × 403.16
  4. Step 4: Simplify right side
    1,327.58x = 802,812.51
  5. Step 5: Solve for x
    x = 802,812.51/1,327.58
  6. Step 6: Final answer
    x = 604.72

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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.