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Finding the Fourth Proportional to 705.31, 973.25 and 390.56

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Solution

The fourth proportional to 705.31, 973.25 and 390.56 is: 538.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.31 : 973.25 = 390.56 : x
  2. Step 2: Convert to fraction form
    705.31/973.25 = 390.56/x
  3. Step 3: Cross multiply
    705.31x = 973.25 × 390.56
  4. Step 4: Simplify right side
    705.31x = 380,107.17
  5. Step 5: Solve for x
    x = 380,107.17/705.31
  6. Step 6: Final answer
    x = 538.92

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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.