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Finding the Fourth Proportional to 430.51, 645.76 and 122.36

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Solution

The fourth proportional to 430.51, 645.76 and 122.36 is: 183.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.51 : 645.76 = 122.36 : x
  2. Step 2: Convert to fraction form
    430.51/645.76 = 122.36/x
  3. Step 3: Cross multiply
    430.51x = 645.76 × 122.36
  4. Step 4: Simplify right side
    430.51x = 79,015.19
  5. Step 5: Solve for x
    x = 79,015.19/430.51
  6. Step 6: Final answer
    x = 183.54

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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.