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Finding the Fourth Proportional to 128,030.20, 191,699.70 and 100,382.20

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Solution

The fourth proportional to 128,030.20, 191,699.70 and 100,382.20 is: 150,302.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,030.20 : 191,699.70 = 100,382.20 : x
  2. Step 2: Convert to fraction form
    128,030.20/191,699.70 = 100,382.20/x
  3. Step 3: Cross multiply
    128,030.20x = 191,699.70 × 100,382.20
  4. Step 4: Simplify right side
    128,030.20x = 19,243,237,625.34
  5. Step 5: Solve for x
    x = 19,243,237,625.34/128,030.20
  6. Step 6: Final answer
    x = 150,302.33

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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.