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Finding the Fourth Proportional to 511.12, 705.30 and 387.16

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Solution

The fourth proportional to 511.12, 705.30 and 387.16 is: 534.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.12 : 705.30 = 387.16 : x
  2. Step 2: Convert to fraction form
    511.12/705.30 = 387.16/x
  3. Step 3: Cross multiply
    511.12x = 705.30 × 387.16
  4. Step 4: Simplify right side
    511.12x = 273,063.95
  5. Step 5: Solve for x
    x = 273,063.95/511.12
  6. Step 6: Final answer
    x = 534.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.