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Finding the Fourth Proportional to 905.83, 1,358.95 and 328.71

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Solution

The fourth proportional to 905.83, 1,358.95 and 328.71 is: 493.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.83 : 1,358.95 = 328.71 : x
  2. Step 2: Convert to fraction form
    905.83/1,358.95 = 328.71/x
  3. Step 3: Cross multiply
    905.83x = 1,358.95 × 328.71
  4. Step 4: Simplify right side
    905.83x = 446,700.45
  5. Step 5: Solve for x
    x = 446,700.45/905.83
  6. Step 6: Final answer
    x = 493.14

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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.