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Finding the Fourth Proportional to 830.88, 1,245.11 and 397.53

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Solution

The fourth proportional to 830.88, 1,245.11 and 397.53 is: 595.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.88 : 1,245.11 = 397.53 : x
  2. Step 2: Convert to fraction form
    830.88/1,245.11 = 397.53/x
  3. Step 3: Cross multiply
    830.88x = 1,245.11 × 397.53
  4. Step 4: Simplify right side
    830.88x = 494,966.59
  5. Step 5: Solve for x
    x = 494,966.59/830.88
  6. Step 6: Final answer
    x = 595.71

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Double scale
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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.