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Finding the Fourth Proportional to 521,154.40, 781,990.80 and 205,621.60

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Solution

The fourth proportional to 521,154.40, 781,990.80 and 205,621.60 is: 308,534.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,154.40 : 781,990.80 = 205,621.60 : x
  2. Step 2: Convert to fraction form
    521,154.40/781,990.80 = 205,621.60/x
  3. Step 3: Cross multiply
    521,154.40x = 781,990.80 × 205,621.60
  4. Step 4: Simplify right side
    521,154.40x = 160,794,199,481.28
  5. Step 5: Solve for x
    x = 160,794,199,481.28/521,154.40
  6. Step 6: Final answer
    x = 308,534.67

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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.