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Finding the Fourth Proportional to 707.96, 1,059.62 and 640.62

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Solution

The fourth proportional to 707.96, 1,059.62 and 640.62 is: 958.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.96 : 1,059.62 = 640.62 : x
  2. Step 2: Convert to fraction form
    707.96/1,059.62 = 640.62/x
  3. Step 3: Cross multiply
    707.96x = 1,059.62 × 640.62
  4. Step 4: Simplify right side
    707.96x = 678,813.76
  5. Step 5: Solve for x
    x = 678,813.76/707.96
  6. Step 6: Final answer
    x = 958.83

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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.