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Finding the Fourth Proportional to 390,978.20, 587,633.70 and 339,656.60

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Solution

The fourth proportional to 390,978.20, 587,633.70 and 339,656.60 is: 510,498.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,978.20 : 587,633.70 = 339,656.60 : x
  2. Step 2: Convert to fraction form
    390,978.20/587,633.70 = 339,656.60/x
  3. Step 3: Cross multiply
    390,978.20x = 587,633.70 × 339,656.60
  4. Step 4: Simplify right side
    390,978.20x = 199,593,664,587.42
  5. Step 5: Solve for x
    x = 199,593,664,587.42/390,978.20
  6. Step 6: Final answer
    x = 510,498.19

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.