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Finding the Fourth Proportional to 291,391.68, 402,171.84 and 278,094.72

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Solution

The fourth proportional to 291,391.68, 402,171.84 and 278,094.72 is: 383,819.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,391.68 : 402,171.84 = 278,094.72 : x
  2. Step 2: Convert to fraction form
    291,391.68/402,171.84 = 278,094.72/x
  3. Step 3: Cross multiply
    291,391.68x = 402,171.84 × 278,094.72
  4. Step 4: Simplify right side
    291,391.68x = 111,841,865,236.69
  5. Step 5: Solve for x
    x = 111,841,865,236.69/291,391.68
  6. Step 6: Final answer
    x = 383,819.69

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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.