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Finding the Fourth Proportional to 458,659.40, 687,989.10 and 440,288.60

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Solution

The fourth proportional to 458,659.40, 687,989.10 and 440,288.60 is: 660,432.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,659.40 : 687,989.10 = 440,288.60 : x
  2. Step 2: Convert to fraction form
    458,659.40/687,989.10 = 440,288.60/x
  3. Step 3: Cross multiply
    458,659.40x = 687,989.10 × 440,288.60
  4. Step 4: Simplify right side
    458,659.40x = 302,913,757,654.26
  5. Step 5: Solve for x
    x = 302,913,757,654.26/458,659.40
  6. Step 6: Final answer
    x = 660,432.90

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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.