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Finding the Fourth Proportional to 873.76, 1,205.79 and 480.78

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Solution

The fourth proportional to 873.76, 1,205.79 and 480.78 is: 663.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.76 : 1,205.79 = 480.78 : x
  2. Step 2: Convert to fraction form
    873.76/1,205.79 = 480.78/x
  3. Step 3: Cross multiply
    873.76x = 1,205.79 × 480.78
  4. Step 4: Simplify right side
    873.76x = 579,719.72
  5. Step 5: Solve for x
    x = 579,719.72/873.76
  6. Step 6: Final answer
    x = 663.48

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Double scale
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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.