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Finding the Fourth Proportional to 438.50, 657.54 and 207.19

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Solution

The fourth proportional to 438.50, 657.54 and 207.19 is: 310.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.50 : 657.54 = 207.19 : x
  2. Step 2: Convert to fraction form
    438.50/657.54 = 207.19/x
  3. Step 3: Cross multiply
    438.50x = 657.54 × 207.19
  4. Step 4: Simplify right side
    438.50x = 136,235.71
  5. Step 5: Solve for x
    x = 136,235.71/438.50
  6. Step 6: Final answer
    x = 310.69

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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.