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Finding the Fourth Proportional to 830.88, 1,245.90 and 310.86

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Solution

The fourth proportional to 830.88, 1,245.90 and 310.86 is: 466.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.88 : 1,245.90 = 310.86 : x
  2. Step 2: Convert to fraction form
    830.88/1,245.90 = 310.86/x
  3. Step 3: Cross multiply
    830.88x = 1,245.90 × 310.86
  4. Step 4: Simplify right side
    830.88x = 387,300.47
  5. Step 5: Solve for x
    x = 387,300.47/830.88
  6. Step 6: Final answer
    x = 466.13

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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.