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Finding the Fourth Proportional to 429.16, 640.53 and 415.72

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Solution

The fourth proportional to 429.16, 640.53 and 415.72 is: 620.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.16 : 640.53 = 415.72 : x
  2. Step 2: Convert to fraction form
    429.16/640.53 = 415.72/x
  3. Step 3: Cross multiply
    429.16x = 640.53 × 415.72
  4. Step 4: Simplify right side
    429.16x = 266,281.13
  5. Step 5: Solve for x
    x = 266,281.13/429.16
  6. Step 6: Final answer
    x = 620.47

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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.