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Finding the Fourth Proportional to 705.68, 973.81 and 390.93

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Solution

The fourth proportional to 705.68, 973.81 and 390.93 is: 539.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.68 : 973.81 = 390.93 : x
  2. Step 2: Convert to fraction form
    705.68/973.81 = 390.93/x
  3. Step 3: Cross multiply
    705.68x = 973.81 × 390.93
  4. Step 4: Simplify right side
    705.68x = 380,691.54
  5. Step 5: Solve for x
    x = 380,691.54/705.68
  6. Step 6: Final answer
    x = 539.47

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1.5x scale

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.