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Finding the Fourth Proportional to 873.79, 1,205.81 and 480.81

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Solution

The fourth proportional to 873.79, 1,205.81 and 480.81 is: 663.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.79 : 1,205.81 = 480.81 : x
  2. Step 2: Convert to fraction form
    873.79/1,205.81 = 480.81/x
  3. Step 3: Cross multiply
    873.79x = 1,205.81 × 480.81
  4. Step 4: Simplify right side
    873.79x = 579,757.07
  5. Step 5: Solve for x
    x = 579,757.07/873.79
  6. Step 6: Final answer
    x = 663.50

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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.