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Finding the Fourth Proportional to 320.49, 480.35 and 147.12

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Solution

The fourth proportional to 320.49, 480.35 and 147.12 is: 220.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.49 : 480.35 = 147.12 : x
  2. Step 2: Convert to fraction form
    320.49/480.35 = 147.12/x
  3. Step 3: Cross multiply
    320.49x = 480.35 × 147.12
  4. Step 4: Simplify right side
    320.49x = 70,666.83
  5. Step 5: Solve for x
    x = 70,666.83/320.49
  6. Step 6: Final answer
    x = 220.50

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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.