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Finding the Fourth Proportional to 1,238.79, 1,858.20 and 372.99

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Solution

The fourth proportional to 1,238.79, 1,858.20 and 372.99 is: 559.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.79 : 1,858.20 = 372.99 : x
  2. Step 2: Convert to fraction form
    1,238.79/1,858.20 = 372.99/x
  3. Step 3: Cross multiply
    1,238.79x = 1,858.20 × 372.99
  4. Step 4: Simplify right side
    1,238.79x = 693,088.15
  5. Step 5: Solve for x
    x = 693,088.15/1,238.79
  6. Step 6: Final answer
    x = 559.49

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Double scale
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Similar ratio
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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.