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Finding the Fourth Proportional to 438.59, 657.55 and 207.35

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Solution

The fourth proportional to 438.59, 657.55 and 207.35 is: 310.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.59 : 657.55 = 207.35 : x
  2. Step 2: Convert to fraction form
    438.59/657.55 = 207.35/x
  3. Step 3: Cross multiply
    438.59x = 657.55 × 207.35
  4. Step 4: Simplify right side
    438.59x = 136,339.19
  5. Step 5: Solve for x
    x = 136,339.19/438.59
  6. Step 6: Final answer
    x = 310.86

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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.