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Finding the Fourth Proportional to 1,235.81, 1,853.58 and 619.40

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Solution

The fourth proportional to 1,235.81, 1,853.58 and 619.40 is: 929.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.81 : 1,853.58 = 619.40 : x
  2. Step 2: Convert to fraction form
    1,235.81/1,853.58 = 619.40/x
  3. Step 3: Cross multiply
    1,235.81x = 1,853.58 × 619.40
  4. Step 4: Simplify right side
    1,235.81x = 1,148,107.45
  5. Step 5: Solve for x
    x = 1,148,107.45/1,235.81
  6. Step 6: Final answer
    x = 929.03

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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.