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Finding the Fourth Proportional to 830.63, 1,245.02 and 420.14

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Solution

The fourth proportional to 830.63, 1,245.02 and 420.14 is: 629.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.63 : 1,245.02 = 420.14 : x
  2. Step 2: Convert to fraction form
    830.63/1,245.02 = 420.14/x
  3. Step 3: Cross multiply
    830.63x = 1,245.02 × 420.14
  4. Step 4: Simplify right side
    830.63x = 523,074.38
  5. Step 5: Solve for x
    x = 523,074.38/830.63
  6. Step 6: Final answer
    x = 629.74

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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.