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Finding the Fourth Proportional to 1,236.54, 1,854.80 and 312.15

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Solution

The fourth proportional to 1,236.54, 1,854.80 and 312.15 is: 468.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.54 : 1,854.80 = 312.15 : x
  2. Step 2: Convert to fraction form
    1,236.54/1,854.80 = 312.15/x
  3. Step 3: Cross multiply
    1,236.54x = 1,854.80 × 312.15
  4. Step 4: Simplify right side
    1,236.54x = 578,969.62
  5. Step 5: Solve for x
    x = 578,969.62/1,236.54
  6. Step 6: Final answer
    x = 468.22

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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.