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Finding the Fourth Proportional to 528.40, 792.45 and 322.21

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Solution

The fourth proportional to 528.40, 792.45 and 322.21 is: 483.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.40 : 792.45 = 322.21 : x
  2. Step 2: Convert to fraction form
    528.40/792.45 = 322.21/x
  3. Step 3: Cross multiply
    528.40x = 792.45 × 322.21
  4. Step 4: Simplify right side
    528.40x = 255,335.31
  5. Step 5: Solve for x
    x = 255,335.31/528.40
  6. Step 6: Final answer
    x = 483.22

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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.