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Finding the Fourth Proportional to 128,047.46, 191,905.08 and 85,864.32

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Solution

The fourth proportional to 128,047.46, 191,905.08 and 85,864.32 is: 128,685.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,047.46 : 191,905.08 = 85,864.32 : x
  2. Step 2: Convert to fraction form
    128,047.46/191,905.08 = 85,864.32/x
  3. Step 3: Cross multiply
    128,047.46x = 191,905.08 × 85,864.32
  4. Step 4: Simplify right side
    128,047.46x = 16,477,799,198.75
  5. Step 5: Solve for x
    x = 16,477,799,198.75/128,047.46
  6. Step 6: Final answer
    x = 128,685.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.