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Finding the Fourth Proportional to 670.96, 1,005.60 and 426.94

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Solution

The fourth proportional to 670.96, 1,005.60 and 426.94 is: 639.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.96 : 1,005.60 = 426.94 : x
  2. Step 2: Convert to fraction form
    670.96/1,005.60 = 426.94/x
  3. Step 3: Cross multiply
    670.96x = 1,005.60 × 426.94
  4. Step 4: Simplify right side
    670.96x = 429,330.86
  5. Step 5: Solve for x
    x = 429,330.86/670.96
  6. Step 6: Final answer
    x = 639.88

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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.