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Finding the Fourth Proportional to 621, 931.70 and 188.16

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Solution

The fourth proportional to 621, 931.70 and 188.16 is: 282.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    621 : 931.70 = 188.16 : x
  2. Step 2: Convert to fraction form
    621/931.70 = 188.16/x
  3. Step 3: Cross multiply
    621x = 931.70 × 188.16
  4. Step 4: Simplify right side
    621x = 175,305.65
  5. Step 5: Solve for x
    x = 175,305.65/621
  6. Step 6: Final answer
    x = 282.30

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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.