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Finding the Fourth Proportional to 511.57, 763.40 and 438.40

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Solution

The fourth proportional to 511.57, 763.40 and 438.40 is: 654.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.57 : 763.40 = 438.40 : x
  2. Step 2: Convert to fraction form
    511.57/763.40 = 438.40/x
  3. Step 3: Cross multiply
    511.57x = 763.40 × 438.40
  4. Step 4: Simplify right side
    511.57x = 334,672.37
  5. Step 5: Solve for x
    x = 334,672.37/511.57
  6. Step 6: Final answer
    x = 654.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.