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Finding the Fourth Proportional to 683.24, 1,024.16 and 390.36

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Solution

The fourth proportional to 683.24, 1,024.16 and 390.36 is: 585.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.24 : 1,024.16 = 390.36 : x
  2. Step 2: Convert to fraction form
    683.24/1,024.16 = 390.36/x
  3. Step 3: Cross multiply
    683.24x = 1,024.16 × 390.36
  4. Step 4: Simplify right side
    683.24x = 399,791.10
  5. Step 5: Solve for x
    x = 399,791.10/683.24
  6. Step 6: Final answer
    x = 585.14

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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.