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Finding the Fourth Proportional to 384.28, 530.74 and 253.86

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Solution

The fourth proportional to 384.28, 530.74 and 253.86 is: 350.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.28 : 530.74 = 253.86 : x
  2. Step 2: Convert to fraction form
    384.28/530.74 = 253.86/x
  3. Step 3: Cross multiply
    384.28x = 530.74 × 253.86
  4. Step 4: Simplify right side
    384.28x = 134,733.66
  5. Step 5: Solve for x
    x = 134,733.66/384.28
  6. Step 6: Final answer
    x = 350.61

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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.