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Finding the Fourth Proportional to 705.62, 1,058.78 and 431.57

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Solution

The fourth proportional to 705.62, 1,058.78 and 431.57 is: 647.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.62 : 1,058.78 = 431.57 : x
  2. Step 2: Convert to fraction form
    705.62/1,058.78 = 431.57/x
  3. Step 3: Cross multiply
    705.62x = 1,058.78 × 431.57
  4. Step 4: Simplify right side
    705.62x = 456,937.68
  5. Step 5: Solve for x
    x = 456,937.68/705.62
  6. Step 6: Final answer
    x = 647.57

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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.