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Finding the Fourth Proportional to 389.28, 582.88 and 340.07

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Solution

The fourth proportional to 389.28, 582.88 and 340.07 is: 509.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.28 : 582.88 = 340.07 : x
  2. Step 2: Convert to fraction form
    389.28/582.88 = 340.07/x
  3. Step 3: Cross multiply
    389.28x = 582.88 × 340.07
  4. Step 4: Simplify right side
    389.28x = 198,220.00
  5. Step 5: Solve for x
    x = 198,220.00/389.28
  6. Step 6: Final answer
    x = 509.20

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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.