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Finding the Fourth Proportional to 390.02, 537.87 and 359

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Solution

The fourth proportional to 390.02, 537.87 and 359 is: 495.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.02 : 537.87 = 359 : x
  2. Step 2: Convert to fraction form
    390.02/537.87 = 359/x
  3. Step 3: Cross multiply
    390.02x = 537.87 × 359
  4. Step 4: Simplify right side
    390.02x = 193,095.33
  5. Step 5: Solve for x
    x = 193,095.33/390.02
  6. Step 6: Final answer
    x = 495.09

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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.