Home / 1,485.84-2,228.78-390.21

Finding the Fourth Proportional to 1,485.84, 2,228.78 and 390.21

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Solution

The fourth proportional to 1,485.84, 2,228.78 and 390.21 is: 585.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485.84 : 2,228.78 = 390.21 : x
  2. Step 2: Convert to fraction form
    1,485.84/2,228.78 = 390.21/x
  3. Step 3: Cross multiply
    1,485.84x = 2,228.78 × 390.21
  4. Step 4: Simplify right side
    1,485.84x = 869,690.29
  5. Step 5: Solve for x
    x = 869,690.29/1,485.84
  6. Step 6: Final answer
    x = 585.32

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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.