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Finding the Fourth Proportional to 1,239.12, 1,858.65 and 499.05

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Solution

The fourth proportional to 1,239.12, 1,858.65 and 499.05 is: 748.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.12 : 1,858.65 = 499.05 : x
  2. Step 2: Convert to fraction form
    1,239.12/1,858.65 = 499.05/x
  3. Step 3: Cross multiply
    1,239.12x = 1,858.65 × 499.05
  4. Step 4: Simplify right side
    1,239.12x = 927,559.28
  5. Step 5: Solve for x
    x = 927,559.28/1,239.12
  6. Step 6: Final answer
    x = 748.56

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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.