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Finding the Fourth Proportional to 213,129.20, 293,937.72 and 128,230.40

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Solution

The fourth proportional to 213,129.20, 293,937.72 and 128,230.40 is: 176,849.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,129.20 : 293,937.72 = 128,230.40 : x
  2. Step 2: Convert to fraction form
    213,129.20/293,937.72 = 128,230.40/x
  3. Step 3: Cross multiply
    213,129.20x = 293,937.72 × 128,230.40
  4. Step 4: Simplify right side
    213,129.20x = 37,691,751,410.69
  5. Step 5: Solve for x
    x = 37,691,751,410.69/213,129.20
  6. Step 6: Final answer
    x = 176,849.31

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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.