Home / 129,338.28-178,485-72,749.64

Finding the Fourth Proportional to 129,338.28, 178,485 and 72,749.64

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Solution

The fourth proportional to 129,338.28, 178,485 and 72,749.64 is: 100,393.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,338.28 : 178,485 = 72,749.64 : x
  2. Step 2: Convert to fraction form
    129,338.28/178,485 = 72,749.64/x
  3. Step 3: Cross multiply
    129,338.28x = 178,485 × 72,749.64
  4. Step 4: Simplify right side
    129,338.28x = 12,984,719,495.40
  5. Step 5: Solve for x
    x = 12,984,719,495.40/129,338.28
  6. Step 6: Final answer
    x = 100,393.48

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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.