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Finding the Fourth Proportional to 469.75, 648.10 and 283.30

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Solution

The fourth proportional to 469.75, 648.10 and 283.30 is: 390.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.75 : 648.10 = 283.30 : x
  2. Step 2: Convert to fraction form
    469.75/648.10 = 283.30/x
  3. Step 3: Cross multiply
    469.75x = 648.10 × 283.30
  4. Step 4: Simplify right side
    469.75x = 183,606.73
  5. Step 5: Solve for x
    x = 183,606.73/469.75
  6. Step 6: Final answer
    x = 390.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.