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Finding the Fourth Proportional to 991.05, 1,486.74 and 374.81

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Solution

The fourth proportional to 991.05, 1,486.74 and 374.81 is: 562.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.05 : 1,486.74 = 374.81 : x
  2. Step 2: Convert to fraction form
    991.05/1,486.74 = 374.81/x
  3. Step 3: Cross multiply
    991.05x = 1,486.74 × 374.81
  4. Step 4: Simplify right side
    991.05x = 557,245.02
  5. Step 5: Solve for x
    x = 557,245.02/991.05
  6. Step 6: Final answer
    x = 562.28

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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.