Home / 1,121.15-1,547.19-623.81

Finding the Fourth Proportional to 1,121.15, 1,547.19 and 623.81

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Solution

The fourth proportional to 1,121.15, 1,547.19 and 623.81 is: 860.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.15 : 1,547.19 = 623.81 : x
  2. Step 2: Convert to fraction form
    1,121.15/1,547.19 = 623.81/x
  3. Step 3: Cross multiply
    1,121.15x = 1,547.19 × 623.81
  4. Step 4: Simplify right side
    1,121.15x = 965,144.86
  5. Step 5: Solve for x
    x = 965,144.86/1,121.15
  6. Step 6: Final answer
    x = 860.86

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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.