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Finding the Fourth Proportional to 530.21, 731.63 and 309.16

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Solution

The fourth proportional to 530.21, 731.63 and 309.16 is: 426.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.21 : 731.63 = 309.16 : x
  2. Step 2: Convert to fraction form
    530.21/731.63 = 309.16/x
  3. Step 3: Cross multiply
    530.21x = 731.63 × 309.16
  4. Step 4: Simplify right side
    530.21x = 226,190.73
  5. Step 5: Solve for x
    x = 226,190.73/530.21
  6. Step 6: Final answer
    x = 426.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.