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Finding the Fourth Proportional to 666.13, 1,004.19 and 621.53

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Solution

The fourth proportional to 666.13, 1,004.19 and 621.53 is: 936.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.13 : 1,004.19 = 621.53 : x
  2. Step 2: Convert to fraction form
    666.13/1,004.19 = 621.53/x
  3. Step 3: Cross multiply
    666.13x = 1,004.19 × 621.53
  4. Step 4: Simplify right side
    666.13x = 624,136.72
  5. Step 5: Solve for x
    x = 624,136.72/666.13
  6. Step 6: Final answer
    x = 936.96

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.