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Finding the Fourth Proportional to 495.18, 683.64 and 390.08

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Solution

The fourth proportional to 495.18, 683.64 and 390.08 is: 538.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.18 : 683.64 = 390.08 : x
  2. Step 2: Convert to fraction form
    495.18/683.64 = 390.08/x
  3. Step 3: Cross multiply
    495.18x = 683.64 × 390.08
  4. Step 4: Simplify right side
    495.18x = 266,676.00
  5. Step 5: Solve for x
    x = 266,676.00/495.18
  6. Step 6: Final answer
    x = 538.54

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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.