Home / 1,245.60-1,868.63-423.80

Finding the Fourth Proportional to 1,245.60, 1,868.63 and 423.80

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Solution

The fourth proportional to 1,245.60, 1,868.63 and 423.80 is: 635.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.60 : 1,868.63 = 423.80 : x
  2. Step 2: Convert to fraction form
    1,245.60/1,868.63 = 423.80/x
  3. Step 3: Cross multiply
    1,245.60x = 1,868.63 × 423.80
  4. Step 4: Simplify right side
    1,245.60x = 791,925.39
  5. Step 5: Solve for x
    x = 791,925.39/1,245.60
  6. Step 6: Final answer
    x = 635.78

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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.