Home / 142,112.40-196,128.51-81,718.41

Finding the Fourth Proportional to 142,112.40, 196,128.51 and 81,718.41

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Solution

The fourth proportional to 142,112.40, 196,128.51 and 81,718.41 is: 112,779.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,112.40 : 196,128.51 = 81,718.41 : x
  2. Step 2: Convert to fraction form
    142,112.40/196,128.51 = 81,718.41/x
  3. Step 3: Cross multiply
    142,112.40x = 196,128.51 × 81,718.41
  4. Step 4: Simplify right side
    142,112.40x = 16,027,309,992.87
  5. Step 5: Solve for x
    x = 16,027,309,992.87/142,112.40
  6. Step 6: Final answer
    x = 112,779.11

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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.