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Finding the Fourth Proportional to 530.45, 731.60 and 405.80

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Solution

The fourth proportional to 530.45, 731.60 and 405.80 is: 559.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.45 : 731.60 = 405.80 : x
  2. Step 2: Convert to fraction form
    530.45/731.60 = 405.80/x
  3. Step 3: Cross multiply
    530.45x = 731.60 × 405.80
  4. Step 4: Simplify right side
    530.45x = 296,879.62
  5. Step 5: Solve for x
    x = 296,879.62/530.45
  6. Step 6: Final answer
    x = 559.68

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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.