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Finding the Fourth Proportional to 530.15, 731.43 and 309.05

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Solution

The fourth proportional to 530.15, 731.43 and 309.05 is: 426.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.15 : 731.43 = 309.05 : x
  2. Step 2: Convert to fraction form
    530.15/731.43 = 309.05/x
  3. Step 3: Cross multiply
    530.15x = 731.43 × 309.05
  4. Step 4: Simplify right side
    530.15x = 226,048.44
  5. Step 5: Solve for x
    x = 226,048.44/530.15
  6. Step 6: Final answer
    x = 426.39

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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.