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Finding the Fourth Proportional to 650.40, 974.70 and 430.39

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Solution

The fourth proportional to 650.40, 974.70 and 430.39 is: 644.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    650.40 : 974.70 = 430.39 : x
  2. Step 2: Convert to fraction form
    650.40/974.70 = 430.39/x
  3. Step 3: Cross multiply
    650.40x = 974.70 × 430.39
  4. Step 4: Simplify right side
    650.40x = 419,503.96
  5. Step 5: Solve for x
    x = 419,503.96/650.40
  6. Step 6: Final answer
    x = 644.99

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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.