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Finding the Fourth Proportional to 219.18, 328.74 and 56.86

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Solution

The fourth proportional to 219.18, 328.74 and 56.86 is: 85.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.18 : 328.74 = 56.86 : x
  2. Step 2: Convert to fraction form
    219.18/328.74 = 56.86/x
  3. Step 3: Cross multiply
    219.18x = 328.74 × 56.86
  4. Step 4: Simplify right side
    219.18x = 18,692.16
  5. Step 5: Solve for x
    x = 18,692.16/219.18
  6. Step 6: Final answer
    x = 85.28

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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.