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Finding the Fourth Proportional to 390,946.60, 587,672.70 and 363,212.20

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Solution

The fourth proportional to 390,946.60, 587,672.70 and 363,212.20 is: 545,982.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,946.60 : 587,672.70 = 363,212.20 : x
  2. Step 2: Convert to fraction form
    390,946.60/587,672.70 = 363,212.20/x
  3. Step 3: Cross multiply
    390,946.60x = 587,672.70 × 363,212.20
  4. Step 4: Simplify right side
    390,946.60x = 213,449,894,246.94
  5. Step 5: Solve for x
    x = 213,449,894,246.94/390,946.60
  6. Step 6: Final answer
    x = 545,982.22

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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.