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Finding the Fourth Proportional to 457,986.30, 686,979.45 and 221,790.30

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Solution

The fourth proportional to 457,986.30, 686,979.45 and 221,790.30 is: 332,685.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,986.30 : 686,979.45 = 221,790.30 : x
  2. Step 2: Convert to fraction form
    457,986.30/686,979.45 = 221,790.30/x
  3. Step 3: Cross multiply
    457,986.30x = 686,979.45 × 221,790.30
  4. Step 4: Simplify right side
    457,986.30x = 152,365,378,309.34
  5. Step 5: Solve for x
    x = 152,365,378,309.34/457,986.30
  6. Step 6: Final answer
    x = 332,685.45

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Double scale
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Similar ratio
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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.