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Finding the Fourth Proportional to 829.60, 1,245.60 and 587.20

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Solution

The fourth proportional to 829.60, 1,245.60 and 587.20 is: 881.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.60 : 1,245.60 = 587.20 : x
  2. Step 2: Convert to fraction form
    829.60/1,245.60 = 587.20/x
  3. Step 3: Cross multiply
    829.60x = 1,245.60 × 587.20
  4. Step 4: Simplify right side
    829.60x = 731,416.32
  5. Step 5: Solve for x
    x = 731,416.32/829.60
  6. Step 6: Final answer
    x = 881.65

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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.