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Finding the Fourth Proportional to 431.88, 646.60 and 397.86

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Solution

The fourth proportional to 431.88, 646.60 and 397.86 is: 595.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.88 : 646.60 = 397.86 : x
  2. Step 2: Convert to fraction form
    431.88/646.60 = 397.86/x
  3. Step 3: Cross multiply
    431.88x = 646.60 × 397.86
  4. Step 4: Simplify right side
    431.88x = 257,256.28
  5. Step 5: Solve for x
    x = 257,256.28/431.88
  6. Step 6: Final answer
    x = 595.67

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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.