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Finding the Fourth Proportional to 128,424.40, 177,253.32 and 78,139.60

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Solution

The fourth proportional to 128,424.40, 177,253.32 and 78,139.60 is: 107,849.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,424.40 : 177,253.32 = 78,139.60 : x
  2. Step 2: Convert to fraction form
    128,424.40/177,253.32 = 78,139.60/x
  3. Step 3: Cross multiply
    128,424.40x = 177,253.32 × 78,139.60
  4. Step 4: Simplify right side
    128,424.40x = 13,850,503,523.47
  5. Step 5: Solve for x
    x = 13,850,503,523.47/128,424.40
  6. Step 6: Final answer
    x = 107,849.47

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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.