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Finding the Fourth Proportional to 528.99, 730.20 and 405.15

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Solution

The fourth proportional to 528.99, 730.20 and 405.15 is: 559.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.99 : 730.20 = 405.15 : x
  2. Step 2: Convert to fraction form
    528.99/730.20 = 405.15/x
  3. Step 3: Cross multiply
    528.99x = 730.20 × 405.15
  4. Step 4: Simplify right side
    528.99x = 295,840.53
  5. Step 5: Solve for x
    x = 295,840.53/528.99
  6. Step 6: Final answer
    x = 559.26

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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.