Home / 1,490.12-2,235.18-394.40

Finding the Fourth Proportional to 1,490.12, 2,235.18 and 394.40

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Solution

The fourth proportional to 1,490.12, 2,235.18 and 394.40 is: 591.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.12 : 2,235.18 = 394.40 : x
  2. Step 2: Convert to fraction form
    1,490.12/2,235.18 = 394.40/x
  3. Step 3: Cross multiply
    1,490.12x = 2,235.18 × 394.40
  4. Step 4: Simplify right side
    1,490.12x = 881,556.79
  5. Step 5: Solve for x
    x = 881,556.79/1,490.12
  6. Step 6: Final answer
    x = 591.60

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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.