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Finding the Fourth Proportional to 438, 657.24 and 210

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Solution

The fourth proportional to 438, 657.24 and 210 is: 315.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    438 : 657.24 = 210 : x
  2. Step 2: Convert to fraction form
    438/657.24 = 210/x
  3. Step 3: Cross multiply
    438x = 657.24 × 210
  4. Step 4: Simplify right side
    438x = 138,020.40
  5. Step 5: Solve for x
    x = 138,020.40/438
  6. Step 6: Final answer
    x = 315.12

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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.