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Finding the Fourth Proportional to 511.02, 705.21 and 278.15

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Solution

The fourth proportional to 511.02, 705.21 and 278.15 is: 383.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.02 : 705.21 = 278.15 : x
  2. Step 2: Convert to fraction form
    511.02/705.21 = 278.15/x
  3. Step 3: Cross multiply
    511.02x = 705.21 × 278.15
  4. Step 4: Simplify right side
    511.02x = 196,154.16
  5. Step 5: Solve for x
    x = 196,154.16/511.02
  6. Step 6: Final answer
    x = 383.85

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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.