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Finding the Fourth Proportional to 354.21, 530.28 and 320.05

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Solution

The fourth proportional to 354.21, 530.28 and 320.05 is: 479.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.21 : 530.28 = 320.05 : x
  2. Step 2: Convert to fraction form
    354.21/530.28 = 320.05/x
  3. Step 3: Cross multiply
    354.21x = 530.28 × 320.05
  4. Step 4: Simplify right side
    354.21x = 169,716.78
  5. Step 5: Solve for x
    x = 169,716.78/354.21
  6. Step 6: Final answer
    x = 479.15

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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.