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Finding the Fourth Proportional to 378,045.64, 521,778.54 and 217,009.56

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Solution

The fourth proportional to 378,045.64, 521,778.54 and 217,009.56 is: 299,516.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,045.64 : 521,778.54 = 217,009.56 : x
  2. Step 2: Convert to fraction form
    378,045.64/521,778.54 = 217,009.56/x
  3. Step 3: Cross multiply
    378,045.64x = 521,778.54 × 217,009.56
  4. Step 4: Simplify right side
    378,045.64x = 113,230,931,382.84
  5. Step 5: Solve for x
    x = 113,230,931,382.84/378,045.64
  6. Step 6: Final answer
    x = 299,516.56

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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.