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Finding the Fourth Proportional to 328.80, 492.63 and 315.30

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Solution

The fourth proportional to 328.80, 492.63 and 315.30 is: 472.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.80 : 492.63 = 315.30 : x
  2. Step 2: Convert to fraction form
    328.80/492.63 = 315.30/x
  3. Step 3: Cross multiply
    328.80x = 492.63 × 315.30
  4. Step 4: Simplify right side
    328.80x = 155,326.24
  5. Step 5: Solve for x
    x = 155,326.24/328.80
  6. Step 6: Final answer
    x = 472.40

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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.