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Finding the Fourth Proportional to 1,124.36, 1,553.76 and 810.65

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Solution

The fourth proportional to 1,124.36, 1,553.76 and 810.65 is: 1,120.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.36 : 1,553.76 = 810.65 : x
  2. Step 2: Convert to fraction form
    1,124.36/1,553.76 = 810.65/x
  3. Step 3: Cross multiply
    1,124.36x = 1,553.76 × 810.65
  4. Step 4: Simplify right side
    1,124.36x = 1,259,559.43
  5. Step 5: Solve for x
    x = 1,259,559.43/1,124.36
  6. Step 6: Final answer
    x = 1,120.25

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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.