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Finding the Fourth Proportional to 378,211.20, 521,956.20 and 217,118.40

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Solution

The fourth proportional to 378,211.20, 521,956.20 and 217,118.40 is: 299,637.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,211.20 : 521,956.20 = 217,118.40 : x
  2. Step 2: Convert to fraction form
    378,211.20/521,956.20 = 217,118.40/x
  3. Step 3: Cross multiply
    378,211.20x = 521,956.20 × 217,118.40
  4. Step 4: Simplify right side
    378,211.20x = 113,326,295,014.08
  5. Step 5: Solve for x
    x = 113,326,295,014.08/378,211.20
  6. Step 6: Final answer
    x = 299,637.60

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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.