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Finding the Fourth Proportional to 703.50, 1,055.46 and 318.78

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Solution

The fourth proportional to 703.50, 1,055.46 and 318.78 is: 478.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    703.50 : 1,055.46 = 318.78 : x
  2. Step 2: Convert to fraction form
    703.50/1,055.46 = 318.78/x
  3. Step 3: Cross multiply
    703.50x = 1,055.46 × 318.78
  4. Step 4: Simplify right side
    703.50x = 336,459.54
  5. Step 5: Solve for x
    x = 336,459.54/703.50
  6. Step 6: Final answer
    x = 478.27

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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.