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Finding the Fourth Proportional to 584.50, 875.39 and 421.39

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Solution

The fourth proportional to 584.50, 875.39 and 421.39 is: 631.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    584.50 : 875.39 = 421.39 : x
  2. Step 2: Convert to fraction form
    584.50/875.39 = 421.39/x
  3. Step 3: Cross multiply
    584.50x = 875.39 × 421.39
  4. Step 4: Simplify right side
    584.50x = 368,880.59
  5. Step 5: Solve for x
    x = 368,880.59/584.50
  6. Step 6: Final answer
    x = 631.10

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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.