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Finding the Fourth Proportional to 603.20, 904.80 and 218.72

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Solution

The fourth proportional to 603.20, 904.80 and 218.72 is: 328.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.20 : 904.80 = 218.72 : x
  2. Step 2: Convert to fraction form
    603.20/904.80 = 218.72/x
  3. Step 3: Cross multiply
    603.20x = 904.80 × 218.72
  4. Step 4: Simplify right side
    603.20x = 197,897.86
  5. Step 5: Solve for x
    x = 197,897.86/603.20
  6. Step 6: Final answer
    x = 328.08

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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.