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Finding the Fourth Proportional to 621, 931.98 and 475.20

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Solution

The fourth proportional to 621, 931.98 and 475.20 is: 713.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    621 : 931.98 = 475.20 : x
  2. Step 2: Convert to fraction form
    621/931.98 = 475.20/x
  3. Step 3: Cross multiply
    621x = 931.98 × 475.20
  4. Step 4: Simplify right side
    621x = 442,876.90
  5. Step 5: Solve for x
    x = 442,876.90/621
  6. Step 6: Final answer
    x = 713.17

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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.