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Finding the Fourth Proportional to 217,085.40, 325,530.90 and 83,921.40

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Solution

The fourth proportional to 217,085.40, 325,530.90 and 83,921.40 is: 125,844.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,085.40 : 325,530.90 = 83,921.40 : x
  2. Step 2: Convert to fraction form
    217,085.40/325,530.90 = 83,921.40/x
  3. Step 3: Cross multiply
    217,085.40x = 325,530.90 × 83,921.40
  4. Step 4: Simplify right side
    217,085.40x = 27,319,008,871.26
  5. Step 5: Solve for x
    x = 27,319,008,871.26/217,085.40
  6. Step 6: Final answer
    x = 125,844.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.