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Finding the Fourth Proportional to 306,613.76, 459,885.59 and 81,991.70

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Solution

The fourth proportional to 306,613.76, 459,885.59 and 81,991.70 is: 122,978.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    306,613.76 : 459,885.59 = 81,991.70 : x
  2. Step 2: Convert to fraction form
    306,613.76/459,885.59 = 81,991.70/x
  3. Step 3: Cross multiply
    306,613.76x = 459,885.59 × 81,991.70
  4. Step 4: Simplify right side
    306,613.76x = 37,706,801,329.60
  5. Step 5: Solve for x
    x = 37,706,801,329.60/306,613.76
  6. Step 6: Final answer
    x = 122,978.18

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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.