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Finding the Fourth Proportional to 630.55, 869.90 and 431.06

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Solution

The fourth proportional to 630.55, 869.90 and 431.06 is: 594.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.55 : 869.90 = 431.06 : x
  2. Step 2: Convert to fraction form
    630.55/869.90 = 431.06/x
  3. Step 3: Cross multiply
    630.55x = 869.90 × 431.06
  4. Step 4: Simplify right side
    630.55x = 374,979.09
  5. Step 5: Solve for x
    x = 374,979.09/630.55
  6. Step 6: Final answer
    x = 594.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.