Home / 143,135.63-215,708.76-128,921.95

Finding the Fourth Proportional to 143,135.63, 215,708.76 and 128,921.95

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Solution

The fourth proportional to 143,135.63, 215,708.76 and 128,921.95 is: 194,288.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,135.63 : 215,708.76 = 128,921.95 : x
  2. Step 2: Convert to fraction form
    143,135.63/215,708.76 = 128,921.95/x
  3. Step 3: Cross multiply
    143,135.63x = 215,708.76 × 128,921.95
  4. Step 4: Simplify right side
    143,135.63x = 27,809,594,188.25
  5. Step 5: Solve for x
    x = 27,809,594,188.25/143,135.63
  6. Step 6: Final answer
    x = 194,288.41

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.