Home / 1,121.16-1,547.20-623.80

Finding the Fourth Proportional to 1,121.16, 1,547.20 and 623.80

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Solution

The fourth proportional to 1,121.16, 1,547.20 and 623.80 is: 860.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.16 : 1,547.20 = 623.80 : x
  2. Step 2: Convert to fraction form
    1,121.16/1,547.20 = 623.80/x
  3. Step 3: Cross multiply
    1,121.16x = 1,547.20 × 623.80
  4. Step 4: Simplify right side
    1,121.16x = 965,143.36
  5. Step 5: Solve for x
    x = 965,143.36/1,121.16
  6. Step 6: Final answer
    x = 860.84

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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.