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Finding the Fourth Proportional to 703.86, 1,055.66 and 216.78

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Solution

The fourth proportional to 703.86, 1,055.66 and 216.78 is: 325.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    703.86 : 1,055.66 = 216.78 : x
  2. Step 2: Convert to fraction form
    703.86/1,055.66 = 216.78/x
  3. Step 3: Cross multiply
    703.86x = 1,055.66 × 216.78
  4. Step 4: Simplify right side
    703.86x = 228,844.89
  5. Step 5: Solve for x
    x = 228,844.89/703.86
  6. Step 6: Final answer
    x = 325.13

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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.