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Finding the Fourth Proportional to 664.02, 993.60 and 390.24

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Solution

The fourth proportional to 664.02, 993.60 and 390.24 is: 583.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.02 : 993.60 = 390.24 : x
  2. Step 2: Convert to fraction form
    664.02/993.60 = 390.24/x
  3. Step 3: Cross multiply
    664.02x = 993.60 × 390.24
  4. Step 4: Simplify right side
    664.02x = 387,742.46
  5. Step 5: Solve for x
    x = 387,742.46/664.02
  6. Step 6: Final answer
    x = 583.93

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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.