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Finding the Fourth Proportional to 528.99, 730.26 and 389.40

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Solution

The fourth proportional to 528.99, 730.26 and 389.40 is: 537.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.99 : 730.26 = 389.40 : x
  2. Step 2: Convert to fraction form
    528.99/730.26 = 389.40/x
  3. Step 3: Cross multiply
    528.99x = 730.26 × 389.40
  4. Step 4: Simplify right side
    528.99x = 284,363.24
  5. Step 5: Solve for x
    x = 284,363.24/528.99
  6. Step 6: Final answer
    x = 537.56

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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.