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Finding the Fourth Proportional to 353.91, 530.66 and 145.61

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Solution

The fourth proportional to 353.91, 530.66 and 145.61 is: 218.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.91 : 530.66 = 145.61 : x
  2. Step 2: Convert to fraction form
    353.91/530.66 = 145.61/x
  3. Step 3: Cross multiply
    353.91x = 530.66 × 145.61
  4. Step 4: Simplify right side
    353.91x = 77,270.37
  5. Step 5: Solve for x
    x = 77,270.37/353.91
  6. Step 6: Final answer
    x = 218.34

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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.