Home / 1,121.10-1,547.10-623.75

Finding the Fourth Proportional to 1,121.10, 1,547.10 and 623.75

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Solution

The fourth proportional to 1,121.10, 1,547.10 and 623.75 is: 860.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.10 : 1,547.10 = 623.75 : x
  2. Step 2: Convert to fraction form
    1,121.10/1,547.10 = 623.75/x
  3. Step 3: Cross multiply
    1,121.10x = 1,547.10 × 623.75
  4. Step 4: Simplify right side
    1,121.10x = 964,995.89
  5. Step 5: Solve for x
    x = 964,995.89/1,121.10
  6. Step 6: Final answer
    x = 860.76

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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.