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Finding the Fourth Proportional to 666.18, 1,004.29 and 621.60

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Solution

The fourth proportional to 666.18, 1,004.29 and 621.60 is: 937.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.18 : 1,004.29 = 621.60 : x
  2. Step 2: Convert to fraction form
    666.18/1,004.29 = 621.60/x
  3. Step 3: Cross multiply
    666.18x = 1,004.29 × 621.60
  4. Step 4: Simplify right side
    666.18x = 624,266.66
  5. Step 5: Solve for x
    x = 624,266.66/666.18
  6. Step 6: Final answer
    x = 937.08

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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.