Home / 129,557.79-178,789.32-72,197.64

Finding the Fourth Proportional to 129,557.79, 178,789.32 and 72,197.64

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Solution

The fourth proportional to 129,557.79, 178,789.32 and 72,197.64 is: 99,632.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,557.79 : 178,789.32 = 72,197.64 : x
  2. Step 2: Convert to fraction form
    129,557.79/178,789.32 = 72,197.64/x
  3. Step 3: Cross multiply
    129,557.79x = 178,789.32 × 72,197.64
  4. Step 4: Simplify right side
    129,557.79x = 12,908,166,961.20
  5. Step 5: Solve for x
    x = 12,908,166,961.20/129,557.79
  6. Step 6: Final answer
    x = 99,632.50

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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.