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Finding the Fourth Proportional to 128,051.79, 191,920.34 and 90,622.50

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Solution

The fourth proportional to 128,051.79, 191,920.34 and 90,622.50 is: 135,822.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,051.79 : 191,920.34 = 90,622.50 : x
  2. Step 2: Convert to fraction form
    128,051.79/191,920.34 = 90,622.50/x
  3. Step 3: Cross multiply
    128,051.79x = 191,920.34 × 90,622.50
  4. Step 4: Simplify right side
    128,051.79x = 17,392,300,558.54
  5. Step 5: Solve for x
    x = 17,392,300,558.54/128,051.79
  6. Step 6: Final answer
    x = 135,822.39

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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.