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Finding the Fourth Proportional to 461.04, 691.72 and 172.40

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Solution

The fourth proportional to 461.04, 691.72 and 172.40 is: 258.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.04 : 691.72 = 172.40 : x
  2. Step 2: Convert to fraction form
    461.04/691.72 = 172.40/x
  3. Step 3: Cross multiply
    461.04x = 691.72 × 172.40
  4. Step 4: Simplify right side
    461.04x = 119,252.53
  5. Step 5: Solve for x
    x = 119,252.53/461.04
  6. Step 6: Final answer
    x = 258.66

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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.