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Finding the Fourth Proportional to 471.90, 706.53 and 428.60

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Solution

The fourth proportional to 471.90, 706.53 and 428.60 is: 641.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    471.90 : 706.53 = 428.60 : x
  2. Step 2: Convert to fraction form
    471.90/706.53 = 428.60/x
  3. Step 3: Cross multiply
    471.90x = 706.53 × 428.60
  4. Step 4: Simplify right side
    471.90x = 302,818.76
  5. Step 5: Solve for x
    x = 302,818.76/471.90
  6. Step 6: Final answer
    x = 641.70

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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.