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Finding the Fourth Proportional to 830.60, 1,245.16 and 317.96

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Solution

The fourth proportional to 830.60, 1,245.16 and 317.96 is: 476.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.60 : 1,245.16 = 317.96 : x
  2. Step 2: Convert to fraction form
    830.60/1,245.16 = 317.96/x
  3. Step 3: Cross multiply
    830.60x = 1,245.16 × 317.96
  4. Step 4: Simplify right side
    830.60x = 395,911.07
  5. Step 5: Solve for x
    x = 395,911.07/830.60
  6. Step 6: Final answer
    x = 476.66

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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.