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Finding the Fourth Proportional to 351.80, 530.21 and 330.20

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Solution

The fourth proportional to 351.80, 530.21 and 330.20 is: 497.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.80 : 530.21 = 330.20 : x
  2. Step 2: Convert to fraction form
    351.80/530.21 = 330.20/x
  3. Step 3: Cross multiply
    351.80x = 530.21 × 330.20
  4. Step 4: Simplify right side
    351.80x = 175,075.34
  5. Step 5: Solve for x
    x = 175,075.34/351.80
  6. Step 6: Final answer
    x = 497.66

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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.