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Finding the Fourth Proportional to 389,601.60, 584,359.20 and 319,358.40

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Solution

The fourth proportional to 389,601.60, 584,359.20 and 319,358.40 is: 479,002.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,601.60 : 584,359.20 = 319,358.40 : x
  2. Step 2: Convert to fraction form
    389,601.60/584,359.20 = 319,358.40/x
  3. Step 3: Cross multiply
    389,601.60x = 584,359.20 × 319,358.40
  4. Step 4: Simplify right side
    389,601.60x = 186,620,019,137.28
  5. Step 5: Solve for x
    x = 186,620,019,137.28/389,601.60
  6. Step 6: Final answer
    x = 479,002.19

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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.