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Finding the Fourth Proportional to 511.50, 705.80 and 290.45

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Solution

The fourth proportional to 511.50, 705.80 and 290.45 is: 400.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.50 : 705.80 = 290.45 : x
  2. Step 2: Convert to fraction form
    511.50/705.80 = 290.45/x
  3. Step 3: Cross multiply
    511.50x = 705.80 × 290.45
  4. Step 4: Simplify right side
    511.50x = 204,994.63
  5. Step 5: Solve for x
    x = 204,994.63/511.50
  6. Step 6: Final answer
    x = 400.77

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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.