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Finding the Fourth Proportional to 705.47, 973.46 and 390.74

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Solution

The fourth proportional to 705.47, 973.46 and 390.74 is: 539.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.47 : 973.46 = 390.74 : x
  2. Step 2: Convert to fraction form
    705.47/973.46 = 390.74/x
  3. Step 3: Cross multiply
    705.47x = 973.46 × 390.74
  4. Step 4: Simplify right side
    705.47x = 380,365.87
  5. Step 5: Solve for x
    x = 380,365.87/705.47
  6. Step 6: Final answer
    x = 539.17

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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.