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Finding the Fourth Proportional to 128,401.44, 177,263.64 and 77,423.28

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Solution

The fourth proportional to 128,401.44, 177,263.64 and 77,423.28 is: 106,886.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,401.44 : 177,263.64 = 77,423.28 : x
  2. Step 2: Convert to fraction form
    128,401.44/177,263.64 = 77,423.28/x
  3. Step 3: Cross multiply
    128,401.44x = 177,263.64 × 77,423.28
  4. Step 4: Simplify right side
    128,401.44x = 13,724,332,433.54
  5. Step 5: Solve for x
    x = 13,724,332,433.54/128,401.44
  6. Step 6: Final answer
    x = 106,886.13

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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.