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Finding the Fourth Proportional to 515,667.40, 711,609.96 and 286,211.28

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Solution

The fourth proportional to 515,667.40, 711,609.96 and 286,211.28 is: 394,965.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,667.40 : 711,609.96 = 286,211.28 : x
  2. Step 2: Convert to fraction form
    515,667.40/711,609.96 = 286,211.28/x
  3. Step 3: Cross multiply
    515,667.40x = 711,609.96 × 286,211.28
  4. Step 4: Simplify right side
    515,667.40x = 203,670,797,512.35
  5. Step 5: Solve for x
    x = 203,670,797,512.35/515,667.40
  6. Step 6: Final answer
    x = 394,965.43

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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.