Home / 1,290.20-1,935.15-559.18

Finding the Fourth Proportional to 1,290.20, 1,935.15 and 559.18

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Solution

The fourth proportional to 1,290.20, 1,935.15 and 559.18 is: 838.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.20 : 1,935.15 = 559.18 : x
  2. Step 2: Convert to fraction form
    1,290.20/1,935.15 = 559.18/x
  3. Step 3: Cross multiply
    1,290.20x = 1,935.15 × 559.18
  4. Step 4: Simplify right side
    1,290.20x = 1,082,097.18
  5. Step 5: Solve for x
    x = 1,082,097.18/1,290.20
  6. Step 6: Final answer
    x = 838.70

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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.