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Finding the Fourth Proportional to 862,800.60, 1,294,200.90 and 390,408.60

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Solution

The fourth proportional to 862,800.60, 1,294,200.90 and 390,408.60 is: 585,612.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    862,800.60 : 1,294,200.90 = 390,408.60 : x
  2. Step 2: Convert to fraction form
    862,800.60/1,294,200.90 = 390,408.60/x
  3. Step 3: Cross multiply
    862,800.60x = 1,294,200.90 × 390,408.60
  4. Step 4: Simplify right side
    862,800.60x = 505,267,161,487.74
  5. Step 5: Solve for x
    x = 505,267,161,487.74/862,800.60
  6. Step 6: Final answer
    x = 585,612.90

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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.