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Finding the Fourth Proportional to 705.68, 973.79 and 390.95

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Solution

The fourth proportional to 705.68, 973.79 and 390.95 is: 539.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.68 : 973.79 = 390.95 : x
  2. Step 2: Convert to fraction form
    705.68/973.79 = 390.95/x
  3. Step 3: Cross multiply
    705.68x = 973.79 × 390.95
  4. Step 4: Simplify right side
    705.68x = 380,703.20
  5. Step 5: Solve for x
    x = 380,703.20/705.68
  6. Step 6: Final answer
    x = 539.48

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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.