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Finding the Fourth Proportional to 320,640.66, 480,960.54 and 128,601.72

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Solution

The fourth proportional to 320,640.66, 480,960.54 and 128,601.72 is: 192,902.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,640.66 : 480,960.54 = 128,601.72 : x
  2. Step 2: Convert to fraction form
    320,640.66/480,960.54 = 128,601.72/x
  3. Step 3: Cross multiply
    320,640.66x = 480,960.54 × 128,601.72
  4. Step 4: Simplify right side
    320,640.66x = 61,852,352,696.13
  5. Step 5: Solve for x
    x = 61,852,352,696.13/320,640.66
  6. Step 6: Final answer
    x = 192,902.40

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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.