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Finding the Fourth Proportional to 430.98, 646.48 and 397.55

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Solution

The fourth proportional to 430.98, 646.48 and 397.55 is: 596.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.98 : 646.48 = 397.55 : x
  2. Step 2: Convert to fraction form
    430.98/646.48 = 397.55/x
  3. Step 3: Cross multiply
    430.98x = 646.48 × 397.55
  4. Step 4: Simplify right side
    430.98x = 257,004.89
  5. Step 5: Solve for x
    x = 257,004.89/430.98
  6. Step 6: Final answer
    x = 596.33

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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.