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Finding the Fourth Proportional to 401.16, 553.80 and 283.40

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Solution

The fourth proportional to 401.16, 553.80 and 283.40 is: 391.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.16 : 553.80 = 283.40 : x
  2. Step 2: Convert to fraction form
    401.16/553.80 = 283.40/x
  3. Step 3: Cross multiply
    401.16x = 553.80 × 283.40
  4. Step 4: Simplify right side
    401.16x = 156,944.15
  5. Step 5: Solve for x
    x = 156,944.15/401.16
  6. Step 6: Final answer
    x = 391.23

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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.