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Finding the Fourth Proportional to 554.20, 831.30 and 509.20

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Solution

The fourth proportional to 554.20, 831.30 and 509.20 is: 763.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.20 : 831.30 = 509.20 : x
  2. Step 2: Convert to fraction form
    554.20/831.30 = 509.20/x
  3. Step 3: Cross multiply
    554.20x = 831.30 × 509.20
  4. Step 4: Simplify right side
    554.20x = 423,297.96
  5. Step 5: Solve for x
    x = 423,297.96/554.20
  6. Step 6: Final answer
    x = 763.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.