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Finding the Fourth Proportional to 529.80, 730.80 and 390.27

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Solution

The fourth proportional to 529.80, 730.80 and 390.27 is: 538.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.80 : 730.80 = 390.27 : x
  2. Step 2: Convert to fraction form
    529.80/730.80 = 390.27/x
  3. Step 3: Cross multiply
    529.80x = 730.80 × 390.27
  4. Step 4: Simplify right side
    529.80x = 285,209.32
  5. Step 5: Solve for x
    x = 285,209.32/529.80
  6. Step 6: Final answer
    x = 538.33

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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.