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Finding the Fourth Proportional to 705.66, 973.76 and 390.92

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Solution

The fourth proportional to 705.66, 973.76 and 390.92 is: 539.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.66 : 973.76 = 390.92 : x
  2. Step 2: Convert to fraction form
    705.66/973.76 = 390.92/x
  3. Step 3: Cross multiply
    705.66x = 973.76 × 390.92
  4. Step 4: Simplify right side
    705.66x = 380,662.26
  5. Step 5: Solve for x
    x = 380,662.26/705.66
  6. Step 6: Final answer
    x = 539.44

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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.