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Finding the Fourth Proportional to 430.48, 643.80 and 422.80

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Solution

The fourth proportional to 430.48, 643.80 and 422.80 is: 632.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.48 : 643.80 = 422.80 : x
  2. Step 2: Convert to fraction form
    430.48/643.80 = 422.80/x
  3. Step 3: Cross multiply
    430.48x = 643.80 × 422.80
  4. Step 4: Simplify right side
    430.48x = 272,198.64
  5. Step 5: Solve for x
    x = 272,198.64/430.48
  6. Step 6: Final answer
    x = 632.31

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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.