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Finding the Fourth Proportional to 830.48, 1,245.32 and 310.56

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Solution

The fourth proportional to 830.48, 1,245.32 and 310.56 is: 465.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.48 : 1,245.32 = 310.56 : x
  2. Step 2: Convert to fraction form
    830.48/1,245.32 = 310.56/x
  3. Step 3: Cross multiply
    830.48x = 1,245.32 × 310.56
  4. Step 4: Simplify right side
    830.48x = 386,746.58
  5. Step 5: Solve for x
    x = 386,746.58/830.48
  6. Step 6: Final answer
    x = 465.69

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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.