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Finding the Fourth Proportional to 128,158.10, 192,128.10 and 78,273.19

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Solution

The fourth proportional to 128,158.10, 192,128.10 and 78,273.19 is: 117,343.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,158.10 : 192,128.10 = 78,273.19 : x
  2. Step 2: Convert to fraction form
    128,158.10/192,128.10 = 78,273.19/x
  3. Step 3: Cross multiply
    128,158.10x = 192,128.10 × 78,273.19
  4. Step 4: Simplify right side
    128,158.10x = 15,038,478,581.84
  5. Step 5: Solve for x
    x = 15,038,478,581.84/128,158.10
  6. Step 6: Final answer
    x = 117,343.18

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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.