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Finding the Fourth Proportional to 434.86, 647.48 and 428.29

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Solution

The fourth proportional to 434.86, 647.48 and 428.29 is: 637.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.86 : 647.48 = 428.29 : x
  2. Step 2: Convert to fraction form
    434.86/647.48 = 428.29/x
  3. Step 3: Cross multiply
    434.86x = 647.48 × 428.29
  4. Step 4: Simplify right side
    434.86x = 277,308.66
  5. Step 5: Solve for x
    x = 277,308.66/434.86
  6. Step 6: Final answer
    x = 637.70

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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.