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Finding the Fourth Proportional to 913.05, 1,368.68 and 479.79

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Solution

The fourth proportional to 913.05, 1,368.68 and 479.79 is: 719.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.05 : 1,368.68 = 479.79 : x
  2. Step 2: Convert to fraction form
    913.05/1,368.68 = 479.79/x
  3. Step 3: Cross multiply
    913.05x = 1,368.68 × 479.79
  4. Step 4: Simplify right side
    913.05x = 656,676.58
  5. Step 5: Solve for x
    x = 656,676.58/913.05
  6. Step 6: Final answer
    x = 719.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.