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Finding the Fourth Proportional to 128,992.16, 178,011.60 and 72,400.16

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Solution

The fourth proportional to 128,992.16, 178,011.60 and 72,400.16 is: 99,913.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,992.16 : 178,011.60 = 72,400.16 : x
  2. Step 2: Convert to fraction form
    128,992.16/178,011.60 = 72,400.16/x
  3. Step 3: Cross multiply
    128,992.16x = 178,011.60 × 72,400.16
  4. Step 4: Simplify right side
    128,992.16x = 12,888,068,321.86
  5. Step 5: Solve for x
    x = 12,888,068,321.86/128,992.16
  6. Step 6: Final answer
    x = 99,913.58

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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.