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Finding the Fourth Proportional to 353.93, 530.86 and 207.21

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Solution

The fourth proportional to 353.93, 530.86 and 207.21 is: 310.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.93 : 530.86 = 207.21 : x
  2. Step 2: Convert to fraction form
    353.93/530.86 = 207.21/x
  3. Step 3: Cross multiply
    353.93x = 530.86 × 207.21
  4. Step 4: Simplify right side
    353.93x = 110,001.36
  5. Step 5: Solve for x
    x = 110,001.36/353.93
  6. Step 6: Final answer
    x = 310.80

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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.