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Finding the Fourth Proportional to 611.35, 916.72 and 428.83

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Solution

The fourth proportional to 611.35, 916.72 and 428.83 is: 643.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.35 : 916.72 = 428.83 : x
  2. Step 2: Convert to fraction form
    611.35/916.72 = 428.83/x
  3. Step 3: Cross multiply
    611.35x = 916.72 × 428.83
  4. Step 4: Simplify right side
    611.35x = 393,113.67
  5. Step 5: Solve for x
    x = 393,113.67/611.35
  6. Step 6: Final answer
    x = 643.03

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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.