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Finding the Fourth Proportional to 528.30, 792.45 and 431.10

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Solution

The fourth proportional to 528.30, 792.45 and 431.10 is: 646.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.30 : 792.45 = 431.10 : x
  2. Step 2: Convert to fraction form
    528.30/792.45 = 431.10/x
  3. Step 3: Cross multiply
    528.30x = 792.45 × 431.10
  4. Step 4: Simplify right side
    528.30x = 341,625.20
  5. Step 5: Solve for x
    x = 341,625.20/528.30
  6. Step 6: Final answer
    x = 646.65

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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.