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Finding the Fourth Proportional to 215,722.85, 297,697.78 and 129,682.76

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Solution

The fourth proportional to 215,722.85, 297,697.78 and 129,682.76 is: 178,962.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,722.85 : 297,697.78 = 129,682.76 : x
  2. Step 2: Convert to fraction form
    215,722.85/297,697.78 = 129,682.76/x
  3. Step 3: Cross multiply
    215,722.85x = 297,697.78 × 129,682.76
  4. Step 4: Simplify right side
    215,722.85x = 38,606,268,429.89
  5. Step 5: Solve for x
    x = 38,606,268,429.89/215,722.85
  6. Step 6: Final answer
    x = 178,962.36

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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.