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Finding the Fourth Proportional to 278,071.36, 417,211.28 and 128,383.36

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Solution

The fourth proportional to 278,071.36, 417,211.28 and 128,383.36 is: 192,623.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,071.36 : 417,211.28 = 128,383.36 : x
  2. Step 2: Convert to fraction form
    278,071.36/417,211.28 = 128,383.36/x
  3. Step 3: Cross multiply
    278,071.36x = 417,211.28 × 128,383.36
  4. Step 4: Simplify right side
    278,071.36x = 53,562,985,956.30
  5. Step 5: Solve for x
    x = 53,562,985,956.30/278,071.36
  6. Step 6: Final answer
    x = 192,623.17

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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.