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Finding the Fourth Proportional to 128,325.10, 192,123.15 and 121,342.90

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Solution

The fourth proportional to 128,325.10, 192,123.15 and 121,342.90 is: 181,669.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,325.10 : 192,123.15 = 121,342.90 : x
  2. Step 2: Convert to fraction form
    128,325.10/192,123.15 = 121,342.90/x
  3. Step 3: Cross multiply
    128,325.10x = 192,123.15 × 121,342.90
  4. Step 4: Simplify right side
    128,325.10x = 23,312,780,178.14
  5. Step 5: Solve for x
    x = 23,312,780,178.14/128,325.10
  6. Step 6: Final answer
    x = 181,669.68

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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.