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Finding the Fourth Proportional to 815.40, 1,124.87 and 483.57

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Solution

The fourth proportional to 815.40, 1,124.87 and 483.57 is: 667.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.40 : 1,124.87 = 483.57 : x
  2. Step 2: Convert to fraction form
    815.40/1,124.87 = 483.57/x
  3. Step 3: Cross multiply
    815.40x = 1,124.87 × 483.57
  4. Step 4: Simplify right side
    815.40x = 543,953.39
  5. Step 5: Solve for x
    x = 543,953.39/815.40
  6. Step 6: Final answer
    x = 667.10

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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.