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Finding the Fourth Proportional to 381.60, 525.36 and 283.20

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Solution

The fourth proportional to 381.60, 525.36 and 283.20 is: 389.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.60 : 525.36 = 283.20 : x
  2. Step 2: Convert to fraction form
    381.60/525.36 = 283.20/x
  3. Step 3: Cross multiply
    381.60x = 525.36 × 283.20
  4. Step 4: Simplify right side
    381.60x = 148,781.95
  5. Step 5: Solve for x
    x = 148,781.95/381.60
  6. Step 6: Final answer
    x = 389.89

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