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Finding the Fourth Proportional to 1,245.02, 1,866.36 and 422.71

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Solution

The fourth proportional to 1,245.02, 1,866.36 and 422.71 is: 633.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.02 : 1,866.36 = 422.71 : x
  2. Step 2: Convert to fraction form
    1,245.02/1,866.36 = 422.71/x
  3. Step 3: Cross multiply
    1,245.02x = 1,866.36 × 422.71
  4. Step 4: Simplify right side
    1,245.02x = 788,929.04
  5. Step 5: Solve for x
    x = 788,929.04/1,245.02
  6. Step 6: Final answer
    x = 633.67

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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.