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Finding the Fourth Proportional to 432.70, 649.58 and 430.72

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Solution

The fourth proportional to 432.70, 649.58 and 430.72 is: 646.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.70 : 649.58 = 430.72 : x
  2. Step 2: Convert to fraction form
    432.70/649.58 = 430.72/x
  3. Step 3: Cross multiply
    432.70x = 649.58 × 430.72
  4. Step 4: Simplify right side
    432.70x = 279,787.10
  5. Step 5: Solve for x
    x = 279,787.10/432.70
  6. Step 6: Final answer
    x = 646.61

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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.