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Finding the Fourth Proportional to 656.64, 985.19 and 245.81

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Solution

The fourth proportional to 656.64, 985.19 and 245.81 is: 368.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.64 : 985.19 = 245.81 : x
  2. Step 2: Convert to fraction form
    656.64/985.19 = 245.81/x
  3. Step 3: Cross multiply
    656.64x = 985.19 × 245.81
  4. Step 4: Simplify right side
    656.64x = 242,170.79
  5. Step 5: Solve for x
    x = 242,170.79/656.64
  6. Step 6: Final answer
    x = 368.80

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.