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Finding the Fourth Proportional to 815.05, 1,124.50 and 483.28

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Solution

The fourth proportional to 815.05, 1,124.50 and 483.28 is: 666.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.05 : 1,124.50 = 483.28 : x
  2. Step 2: Convert to fraction form
    815.05/1,124.50 = 483.28/x
  3. Step 3: Cross multiply
    815.05x = 1,124.50 × 483.28
  4. Step 4: Simplify right side
    815.05x = 543,448.36
  5. Step 5: Solve for x
    x = 543,448.36/815.05
  6. Step 6: Final answer
    x = 666.77

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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.