Home / 1,121.19-1,547.21-623.85

Finding the Fourth Proportional to 1,121.19, 1,547.21 and 623.85

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Solution

The fourth proportional to 1,121.19, 1,547.21 and 623.85 is: 860.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.19 : 1,547.21 = 623.85 : x
  2. Step 2: Convert to fraction form
    1,121.19/1,547.21 = 623.85/x
  3. Step 3: Cross multiply
    1,121.19x = 1,547.21 × 623.85
  4. Step 4: Simplify right side
    1,121.19x = 965,226.96
  5. Step 5: Solve for x
    x = 965,226.96/1,121.19
  6. Step 6: Final answer
    x = 860.90

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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.