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Finding the Fourth Proportional to 430.43, 640.11 and 416.76

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Solution

The fourth proportional to 430.43, 640.11 and 416.76 is: 619.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.43 : 640.11 = 416.76 : x
  2. Step 2: Convert to fraction form
    430.43/640.11 = 416.76/x
  3. Step 3: Cross multiply
    430.43x = 640.11 × 416.76
  4. Step 4: Simplify right side
    430.43x = 266,772.24
  5. Step 5: Solve for x
    x = 266,772.24/430.43
  6. Step 6: Final answer
    x = 619.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.