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Finding the Fourth Proportional to 830.88, 1,245.60 and 398.34

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Solution

The fourth proportional to 830.88, 1,245.60 and 398.34 is: 597.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.88 : 1,245.60 = 398.34 : x
  2. Step 2: Convert to fraction form
    830.88/1,245.60 = 398.34/x
  3. Step 3: Cross multiply
    830.88x = 1,245.60 × 398.34
  4. Step 4: Simplify right side
    830.88x = 496,172.30
  5. Step 5: Solve for x
    x = 496,172.30/830.88
  6. Step 6: Final answer
    x = 597.16

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1.5x scale

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.