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Finding the Fourth Proportional to 495.58, 683.20 and 390.25

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Solution

The fourth proportional to 495.58, 683.20 and 390.25 is: 537.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.58 : 683.20 = 390.25 : x
  2. Step 2: Convert to fraction form
    495.58/683.20 = 390.25/x
  3. Step 3: Cross multiply
    495.58x = 683.20 × 390.25
  4. Step 4: Simplify right side
    495.58x = 266,618.80
  5. Step 5: Solve for x
    x = 266,618.80/495.58
  6. Step 6: Final answer
    x = 537.99

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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.