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Finding the Fourth Proportional to 520,516.68, 780,889.92 and 221,253

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Solution

The fourth proportional to 520,516.68, 780,889.92 and 221,253 is: 331,928.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,516.68 : 780,889.92 = 221,253 : x
  2. Step 2: Convert to fraction form
    520,516.68/780,889.92 = 221,253/x
  3. Step 3: Cross multiply
    520,516.68x = 780,889.92 × 221,253
  4. Step 4: Simplify right side
    520,516.68x = 172,774,237,469.76
  5. Step 5: Solve for x
    x = 172,774,237,469.76/520,516.68
  6. Step 6: Final answer
    x = 331,928.34

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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.