Home / 129,214.40-178,319.73-78,236.45

Finding the Fourth Proportional to 129,214.40, 178,319.73 and 78,236.45

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Solution

The fourth proportional to 129,214.40, 178,319.73 and 78,236.45 is: 107,968.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,214.40 : 178,319.73 = 78,236.45 : x
  2. Step 2: Convert to fraction form
    129,214.40/178,319.73 = 78,236.45/x
  3. Step 3: Cross multiply
    129,214.40x = 178,319.73 × 78,236.45
  4. Step 4: Simplify right side
    129,214.40x = 13,951,102,640.16
  5. Step 5: Solve for x
    x = 13,951,102,640.16/129,214.40
  6. Step 6: Final answer
    x = 107,968.64

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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.