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Finding the Fourth Proportional to 278,301.80, 417,110.30 and 128,333.80

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Solution

The fourth proportional to 278,301.80, 417,110.30 and 128,333.80 is: 192,342.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,301.80 : 417,110.30 = 128,333.80 : x
  2. Step 2: Convert to fraction form
    278,301.80/417,110.30 = 128,333.80/x
  3. Step 3: Cross multiply
    278,301.80x = 417,110.30 × 128,333.80
  4. Step 4: Simplify right side
    278,301.80x = 53,529,349,818.14
  5. Step 5: Solve for x
    x = 53,529,349,818.14/278,301.80
  6. Step 6: Final answer
    x = 192,342.81

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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.