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Finding the Fourth Proportional to 353.51, 530.05 and 145.21

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Solution

The fourth proportional to 353.51, 530.05 and 145.21 is: 217.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.51 : 530.05 = 145.21 : x
  2. Step 2: Convert to fraction form
    353.51/530.05 = 145.21/x
  3. Step 3: Cross multiply
    353.51x = 530.05 × 145.21
  4. Step 4: Simplify right side
    353.51x = 76,966.87
  5. Step 5: Solve for x
    x = 76,966.87/353.51
  6. Step 6: Final answer
    x = 217.72

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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.