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Finding the Fourth Proportional to 612.86, 919.30 and 228.14

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Solution

The fourth proportional to 612.86, 919.30 and 228.14 is: 342.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.86 : 919.30 = 228.14 : x
  2. Step 2: Convert to fraction form
    612.86/919.30 = 228.14/x
  3. Step 3: Cross multiply
    612.86x = 919.30 × 228.14
  4. Step 4: Simplify right side
    612.86x = 209,729.10
  5. Step 5: Solve for x
    x = 209,729.10/612.86
  6. Step 6: Final answer
    x = 342.21

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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.