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Finding the Fourth Proportional to 464.61, 696.81 and 139.89

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Solution

The fourth proportional to 464.61, 696.81 and 139.89 is: 209.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.61 : 696.81 = 139.89 : x
  2. Step 2: Convert to fraction form
    464.61/696.81 = 139.89/x
  3. Step 3: Cross multiply
    464.61x = 696.81 × 139.89
  4. Step 4: Simplify right side
    464.61x = 97,476.75
  5. Step 5: Solve for x
    x = 97,476.75/464.61
  6. Step 6: Final answer
    x = 209.80

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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.