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Finding the Fourth Proportional to 430.29, 645.47 and 122.13

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Solution

The fourth proportional to 430.29, 645.47 and 122.13 is: 183.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.29 : 645.47 = 122.13 : x
  2. Step 2: Convert to fraction form
    430.29/645.47 = 122.13/x
  3. Step 3: Cross multiply
    430.29x = 645.47 × 122.13
  4. Step 4: Simplify right side
    430.29x = 78,832.91
  5. Step 5: Solve for x
    x = 78,832.91/430.29
  6. Step 6: Final answer
    x = 183.21

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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.