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Finding the Fourth Proportional to 830.17, 1,245.31 and 310.16

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Solution

The fourth proportional to 830.17, 1,245.31 and 310.16 is: 465.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.17 : 1,245.31 = 310.16 : x
  2. Step 2: Convert to fraction form
    830.17/1,245.31 = 310.16/x
  3. Step 3: Cross multiply
    830.17x = 1,245.31 × 310.16
  4. Step 4: Simplify right side
    830.17x = 386,237.57
  5. Step 5: Solve for x
    x = 386,237.57/830.17
  6. Step 6: Final answer
    x = 465.25

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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.