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Finding the Fourth Proportional to 289.60, 433.28 and 253.12

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Solution

The fourth proportional to 289.60, 433.28 and 253.12 is: 378.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.60 : 433.28 = 253.12 : x
  2. Step 2: Convert to fraction form
    289.60/433.28 = 253.12/x
  3. Step 3: Cross multiply
    289.60x = 433.28 × 253.12
  4. Step 4: Simplify right side
    289.60x = 109,671.83
  5. Step 5: Solve for x
    x = 109,671.83/289.60
  6. Step 6: Final answer
    x = 378.70

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Why These Related Problems?

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