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Finding the Fourth Proportional to 529.80, 792.90 and 486.60

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Solution

The fourth proportional to 529.80, 792.90 and 486.60 is: 728.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.80 : 792.90 = 486.60 : x
  2. Step 2: Convert to fraction form
    529.80/792.90 = 486.60/x
  3. Step 3: Cross multiply
    529.80x = 792.90 × 486.60
  4. Step 4: Simplify right side
    529.80x = 385,825.14
  5. Step 5: Solve for x
    x = 385,825.14/529.80
  6. Step 6: Final answer
    x = 728.25

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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.