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Finding the Fourth Proportional to 602.40, 903.60 and 217.60

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Solution

The fourth proportional to 602.40, 903.60 and 217.60 is: 326.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.40 : 903.60 = 217.60 : x
  2. Step 2: Convert to fraction form
    602.40/903.60 = 217.60/x
  3. Step 3: Cross multiply
    602.40x = 903.60 × 217.60
  4. Step 4: Simplify right side
    602.40x = 196,623.36
  5. Step 5: Solve for x
    x = 196,623.36/602.40
  6. Step 6: Final answer
    x = 326.40

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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.