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Finding the Fourth Proportional to 405,339.60, 608,009.40 and 340,021.20

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Solution

The fourth proportional to 405,339.60, 608,009.40 and 340,021.20 is: 510,031.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,339.60 : 608,009.40 = 340,021.20 : x
  2. Step 2: Convert to fraction form
    405,339.60/608,009.40 = 340,021.20/x
  3. Step 3: Cross multiply
    405,339.60x = 608,009.40 × 340,021.20
  4. Step 4: Simplify right side
    405,339.60x = 206,736,085,799.28
  5. Step 5: Solve for x
    x = 206,736,085,799.28/405,339.60
  6. Step 6: Final answer
    x = 510,031.80

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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.