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Finding the Fourth Proportional to 403.60, 556.40 and 256.16

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Solution

The fourth proportional to 403.60, 556.40 and 256.16 is: 353.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.60 : 556.40 = 256.16 : x
  2. Step 2: Convert to fraction form
    403.60/556.40 = 256.16/x
  3. Step 3: Cross multiply
    403.60x = 556.40 × 256.16
  4. Step 4: Simplify right side
    403.60x = 142,527.42
  5. Step 5: Solve for x
    x = 142,527.42/403.60
  6. Step 6: Final answer
    x = 353.14

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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.