Home / 1,121.09-1,547.10-623.70

Finding the Fourth Proportional to 1,121.09, 1,547.10 and 623.70

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Solution

The fourth proportional to 1,121.09, 1,547.10 and 623.70 is: 860.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.09 : 1,547.10 = 623.70 : x
  2. Step 2: Convert to fraction form
    1,121.09/1,547.10 = 623.70/x
  3. Step 3: Cross multiply
    1,121.09x = 1,547.10 × 623.70
  4. Step 4: Simplify right side
    1,121.09x = 964,926.27
  5. Step 5: Solve for x
    x = 964,926.27/1,121.09
  6. Step 6: Final answer
    x = 860.71

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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.