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Finding the Fourth Proportional to 528.98, 730.20 and 390.20

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Solution

The fourth proportional to 528.98, 730.20 and 390.20 is: 538.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.98 : 730.20 = 390.20 : x
  2. Step 2: Convert to fraction form
    528.98/730.20 = 390.20/x
  3. Step 3: Cross multiply
    528.98x = 730.20 × 390.20
  4. Step 4: Simplify right side
    528.98x = 284,924.04
  5. Step 5: Solve for x
    x = 284,924.04/528.98
  6. Step 6: Final answer
    x = 538.63

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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.