Home / 129,338.72-178,483.78-71,977.12

Finding the Fourth Proportional to 129,338.72, 178,483.78 and 71,977.12

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Solution

The fourth proportional to 129,338.72, 178,483.78 and 71,977.12 is: 99,326.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,338.72 : 178,483.78 = 71,977.12 : x
  2. Step 2: Convert to fraction form
    129,338.72/178,483.78 = 71,977.12/x
  3. Step 3: Cross multiply
    129,338.72x = 178,483.78 × 71,977.12
  4. Step 4: Simplify right side
    129,338.72x = 12,846,748,693.98
  5. Step 5: Solve for x
    x = 12,846,748,693.98/129,338.72
  6. Step 6: Final answer
    x = 99,326.40

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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.