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Finding the Fourth Proportional to 705.74, 973.95 and 391.00

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Solution

The fourth proportional to 705.74, 973.95 and 391.00 is: 539.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.74 : 973.95 = 391.00 : x
  2. Step 2: Convert to fraction form
    705.74/973.95 = 391.00/x
  3. Step 3: Cross multiply
    705.74x = 973.95 × 391.00
  4. Step 4: Simplify right side
    705.74x = 380,816.21
  5. Step 5: Solve for x
    x = 380,816.21/705.74
  6. Step 6: Final answer
    x = 539.60

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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.