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Finding the Fourth Proportional to 1,245.70, 1,867.29 and 423.70

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Solution

The fourth proportional to 1,245.70, 1,867.29 and 423.70 is: 635.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.70 : 1,867.29 = 423.70 : x
  2. Step 2: Convert to fraction form
    1,245.70/1,867.29 = 423.70/x
  3. Step 3: Cross multiply
    1,245.70x = 1,867.29 × 423.70
  4. Step 4: Simplify right side
    1,245.70x = 791,170.77
  5. Step 5: Solve for x
    x = 791,170.77/1,245.70
  6. Step 6: Final answer
    x = 635.12

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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.