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Finding the Fourth Proportional to 390,643.20, 587,131.20 and 339,321.60

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Solution

The fourth proportional to 390,643.20, 587,131.20 and 339,321.60 is: 509,995.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,643.20 : 587,131.20 = 339,321.60 : x
  2. Step 2: Convert to fraction form
    390,643.20/587,131.20 = 339,321.60/x
  3. Step 3: Cross multiply
    390,643.20x = 587,131.20 × 339,321.60
  4. Step 4: Simplify right side
    390,643.20x = 199,226,298,193.92
  5. Step 5: Solve for x
    x = 199,226,298,193.92/390,643.20
  6. Step 6: Final answer
    x = 509,995.56

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1.5x scale

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.