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Finding the Fourth Proportional to 705.15, 1,057.38 and 260.23

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Solution

The fourth proportional to 705.15, 1,057.38 and 260.23 is: 390.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.15 : 1,057.38 = 260.23 : x
  2. Step 2: Convert to fraction form
    705.15/1,057.38 = 260.23/x
  3. Step 3: Cross multiply
    705.15x = 1,057.38 × 260.23
  4. Step 4: Simplify right side
    705.15x = 275,159.35
  5. Step 5: Solve for x
    x = 275,159.35/705.15
  6. Step 6: Final answer
    x = 390.21

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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.