Home / 1,121.07-1,547.10-623.64

Finding the Fourth Proportional to 1,121.07, 1,547.10 and 623.64

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Solution

The fourth proportional to 1,121.07, 1,547.10 and 623.64 is: 860.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.07 : 1,547.10 = 623.64 : x
  2. Step 2: Convert to fraction form
    1,121.07/1,547.10 = 623.64/x
  3. Step 3: Cross multiply
    1,121.07x = 1,547.10 × 623.64
  4. Step 4: Simplify right side
    1,121.07x = 964,833.44
  5. Step 5: Solve for x
    x = 964,833.44/1,121.07
  6. Step 6: Final answer
    x = 860.64

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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.