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Finding the Fourth Proportional to 530, 795.36 and 386.72

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Solution

The fourth proportional to 530, 795.36 and 386.72 is: 580.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    530 : 795.36 = 386.72 : x
  2. Step 2: Convert to fraction form
    530/795.36 = 386.72/x
  3. Step 3: Cross multiply
    530x = 795.36 × 386.72
  4. Step 4: Simplify right side
    530x = 307,581.62
  5. Step 5: Solve for x
    x = 307,581.62/530
  6. Step 6: Final answer
    x = 580.34

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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.