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Finding the Fourth Proportional to 1,235.79, 1,854.41 and 456.34

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Solution

The fourth proportional to 1,235.79, 1,854.41 and 456.34 is: 684.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.79 : 1,854.41 = 456.34 : x
  2. Step 2: Convert to fraction form
    1,235.79/1,854.41 = 456.34/x
  3. Step 3: Cross multiply
    1,235.79x = 1,854.41 × 456.34
  4. Step 4: Simplify right side
    1,235.79x = 846,241.46
  5. Step 5: Solve for x
    x = 846,241.46/1,235.79
  6. Step 6: Final answer
    x = 684.78

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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.