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Finding the Fourth Proportional to 1,394.74, 2,092.32 and 420.74

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Solution

The fourth proportional to 1,394.74, 2,092.32 and 420.74 is: 631.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394.74 : 2,092.32 = 420.74 : x
  2. Step 2: Convert to fraction form
    1,394.74/2,092.32 = 420.74/x
  3. Step 3: Cross multiply
    1,394.74x = 2,092.32 × 420.74
  4. Step 4: Simplify right side
    1,394.74x = 880,322.72
  5. Step 5: Solve for x
    x = 880,322.72/1,394.74
  6. Step 6: Final answer
    x = 631.17

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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.