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Finding the Fourth Proportional to 705.65, 1,058.47 and 218.70

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Solution

The fourth proportional to 705.65, 1,058.47 and 218.70 is: 328.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.65 : 1,058.47 = 218.70 : x
  2. Step 2: Convert to fraction form
    705.65/1,058.47 = 218.70/x
  3. Step 3: Cross multiply
    705.65x = 1,058.47 × 218.70
  4. Step 4: Simplify right side
    705.65x = 231,486.84
  5. Step 5: Solve for x
    x = 231,486.84/705.65
  6. Step 6: Final answer
    x = 328.05

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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.