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Finding the Fourth Proportional to 217,515.40, 305,221.40 and 217,515.40

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Solution

The fourth proportional to 217,515.40, 305,221.40 and 217,515.40 is: 305,221.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,515.40 : 305,221.40 = 217,515.40 : x
  2. Step 2: Convert to fraction form
    217,515.40/305,221.40 = 217,515.40/x
  3. Step 3: Cross multiply
    217,515.40x = 305,221.40 × 217,515.40
  4. Step 4: Simplify right side
    217,515.40x = 66,390,354,909.56
  5. Step 5: Solve for x
    x = 66,390,354,909.56/217,515.40
  6. Step 6: Final answer
    x = 305,221.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.