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Finding the Fourth Proportional to 351.76, 530.28 and 328.28

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Solution

The fourth proportional to 351.76, 530.28 and 328.28 is: 494.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.76 : 530.28 = 328.28 : x
  2. Step 2: Convert to fraction form
    351.76/530.28 = 328.28/x
  3. Step 3: Cross multiply
    351.76x = 530.28 × 328.28
  4. Step 4: Simplify right side
    351.76x = 174,080.32
  5. Step 5: Solve for x
    x = 174,080.32/351.76
  6. Step 6: Final answer
    x = 494.88

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.