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Finding the Fourth Proportional to 487.74, 730.23 and 389.73

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Solution

The fourth proportional to 487.74, 730.23 and 389.73 is: 583.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.74 : 730.23 = 389.73 : x
  2. Step 2: Convert to fraction form
    487.74/730.23 = 389.73/x
  3. Step 3: Cross multiply
    487.74x = 730.23 × 389.73
  4. Step 4: Simplify right side
    487.74x = 284,592.54
  5. Step 5: Solve for x
    x = 284,592.54/487.74
  6. Step 6: Final answer
    x = 583.49

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Double scale
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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.