Home / 1,121.17-1,547.31-623.89

Finding the Fourth Proportional to 1,121.17, 1,547.31 and 623.89

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Solution

The fourth proportional to 1,121.17, 1,547.31 and 623.89 is: 861.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.17 : 1,547.31 = 623.89 : x
  2. Step 2: Convert to fraction form
    1,121.17/1,547.31 = 623.89/x
  3. Step 3: Cross multiply
    1,121.17x = 1,547.31 × 623.89
  4. Step 4: Simplify right side
    1,121.17x = 965,351.24
  5. Step 5: Solve for x
    x = 965,351.24/1,121.17
  6. Step 6: Final answer
    x = 861.02

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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.