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Finding the Fourth Proportional to 320.49, 480.85 and 128.13

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Solution

The fourth proportional to 320.49, 480.85 and 128.13 is: 192.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.49 : 480.85 = 128.13 : x
  2. Step 2: Convert to fraction form
    320.49/480.85 = 128.13/x
  3. Step 3: Cross multiply
    320.49x = 480.85 × 128.13
  4. Step 4: Simplify right side
    320.49x = 61,608.59
  5. Step 5: Solve for x
    x = 61,608.59/320.49
  6. Step 6: Final answer
    x = 192.24

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1.5x scale

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.