Home / 1,485.83-2,228.88-390.19

Finding the Fourth Proportional to 1,485.83, 2,228.88 and 390.19

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Solution

The fourth proportional to 1,485.83, 2,228.88 and 390.19 is: 585.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485.83 : 2,228.88 = 390.19 : x
  2. Step 2: Convert to fraction form
    1,485.83/2,228.88 = 390.19/x
  3. Step 3: Cross multiply
    1,485.83x = 2,228.88 × 390.19
  4. Step 4: Simplify right side
    1,485.83x = 869,686.69
  5. Step 5: Solve for x
    x = 869,686.69/1,485.83
  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.