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Finding the Fourth Proportional to 1,494.40, 2,061.84 and 1,021.90

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Solution

The fourth proportional to 1,494.40, 2,061.84 and 1,021.90 is: 1,409.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,494.40 : 2,061.84 = 1,021.90 : x
  2. Step 2: Convert to fraction form
    1,494.40/2,061.84 = 1,021.90/x
  3. Step 3: Cross multiply
    1,494.40x = 2,061.84 × 1,021.90
  4. Step 4: Simplify right side
    1,494.40x = 2,106,994.30
  5. Step 5: Solve for x
    x = 2,106,994.30/1,494.40
  6. Step 6: Final answer
    x = 1,409.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.