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Finding the Fourth Proportional to 647.30, 968.55 and 431.30

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Solution

The fourth proportional to 647.30, 968.55 and 431.30 is: 645.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.30 : 968.55 = 431.30 : x
  2. Step 2: Convert to fraction form
    647.30/968.55 = 431.30/x
  3. Step 3: Cross multiply
    647.30x = 968.55 × 431.30
  4. Step 4: Simplify right side
    647.30x = 417,735.62
  5. Step 5: Solve for x
    x = 417,735.62/647.30
  6. Step 6: Final answer
    x = 645.35

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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.