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Finding the Fourth Proportional to 462.04, 689.68 and 428.20

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Solution

The fourth proportional to 462.04, 689.68 and 428.20 is: 639.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.04 : 689.68 = 428.20 : x
  2. Step 2: Convert to fraction form
    462.04/689.68 = 428.20/x
  3. Step 3: Cross multiply
    462.04x = 689.68 × 428.20
  4. Step 4: Simplify right side
    462.04x = 295,320.98
  5. Step 5: Solve for x
    x = 295,320.98/462.04
  6. Step 6: Final answer
    x = 639.17

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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.