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Finding the Fourth Proportional to 705.67, 1,056.66 and 431.38

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Solution

The fourth proportional to 705.67, 1,056.66 and 431.38 is: 645.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.67 : 1,056.66 = 431.38 : x
  2. Step 2: Convert to fraction form
    705.67/1,056.66 = 431.38/x
  3. Step 3: Cross multiply
    705.67x = 1,056.66 × 431.38
  4. Step 4: Simplify right side
    705.67x = 455,821.99
  5. Step 5: Solve for x
    x = 455,821.99/705.67
  6. Step 6: Final answer
    x = 645.94

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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.